Salvavidas: Señor, por favor. ___________________ Sr. García: Está bien. Nade cerca de la costa. Usa bloqueador solar. Nada con otras personas. Usa gafas de sol.

Respuesta :

The correct answer is:  [A]:  "Nade cerca de la costa."
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Explanation:
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This is a short dialog.
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Note:
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Given:
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"Salvavidas:  
Señor, por favor. ___(blank)________________ " .

"Sr. 
García:  Está bien. "
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     "Among the answer choices provided, choose the best answer choice /phrase/ that belongs in the blank."
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The correct answer is:  [A]:   "
Nade cerca de la costa."
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Note:
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"Salvavidas:  Señor, por favor.    Nade cerca de la costa  " .

"Sr. García:  Está bien. "
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Explanation:
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The dialog begins with a "lifeguard" speaking.  We know this because the "lifeguard" is identified by "occupation" rather than actual name; that is, the lifeguard is referred to as:  "Salvavidas"; which is the Spanish word for "lifeguard".  

The lifeguard begins this short dialog by saying,
 
"Sir, please.  ___( followed by a phrase from which we are to choose among the answer choices)___.

Then, "Sr. García" {"Mr. García"} responds by saying:  

"Está bien."  (which, in this context, is Spanish for:  "Okay." ;  or,  "All right." 
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The answer choices provided are:
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Choice:  [A]:  
"Nade cerca de la costa."
                          
→  "Swim near the coast."

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Choice:  [B]:  "
Usa bloqueador solar."  → "[It /he] uses sunblock."
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Choice:  [C]:  
"
Nada con otras personas."  

                       → "[It /he] swims / [is swimming] with other people.
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Choice:  [D]:  
"Usa gafas de sol."  → "[It /he] uses sunglasses." 
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Note:
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 The only answer choice that makes sense is:
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 Answer choice:  [A]:  "Nade cerca de la costa."

                           "Swim near the coast."

→  Furthermore, this "conjugation";  that is, "Nade" ; is a "command form" ; of the Spanish verb, "nadar" — which means:  "to swim" — that corresponds with the "Ud." {that is, "usted"} pronoun which is the Spanish subject pronoun for the third person, single, [formal use of the word:  "you" ; when addressing or referring to ONE person.

Since this is "lifeguard" initiating the conversation—in a "formal tone":

→  [e.g. "Señor, por favor.  ________" ; 

→  and from the [aforementioned] translations of all the other answer choices provided;  and that "Answer choice:  [A]" is the only choice with a "command form" conjugation; and phrase that makes sense;  and correct and appropriate "command form" — and text consistent with the context of the conversation; 

→  We determine that the correct answer is: 
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Answer choice:  [A]:  "Nade cerca de la costa."
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yeah the answer is A