Respuesta :
The correct answer is
a. The effects of cyanide are well known.
This is because the active voice to this would be "Humans know the effect of cyanide" which turned into the passive form of "The effects of cyanide are well known
Explanation:
One of the 2 “voices” of verbs (see additionally active voice). A verb is within the passive once the topic of the sentence is acted on by the verb. for instance, in “The ball was thrown by the pitcher,” the ball (the subject) receives the action of the verb, and was thrown is within the passive.
The sentence written in the passive voice is The effects of cyanide are well known (A).
Further explanation
We use passive voice when we focus on the action or the verb of the sentence rather than who is doing the action (Subject). On the other hand, the active voice is a sentence that focuses on the Subject.
The general form of active and passive voice as follow:
Active voice: Subject+Verb+Object
Passive voice: Object+Verb+Subject
Here are some examples to change active voice into passive voice:
Present Simple Tense
- He writes a letter ---- A letter is written by him.
- They sell cookies ----- Cookies are sold by them.
Present Progressive Tense
- She is writing a letter ----- A letter is being written by her.
- Is she writing a letter? ----- Is a letter being written by her?
Present Perfect Tense
- He has completed the project ----- The project has been completed by him.
- I have written some stories ----- Some stories have been written by me.
Past Simple Tense
- He wrote a letter ----- A letter was written by him.
- Did he write a letter? ---- Was a letter written by him?
Past Progressive Tense
- She was washing the dishes ---- The dishes were being washed by her.
- Was she washing the dishes? ----- Were the dishes being washed by her?
Learn more:
Example of active and passive voice https://brainly.com/question/1809209
Active Voice https://brainly.com/question/790331
Changing Active Voice into Passive voice https://brainly.com/question/1622297
Keywords: passive voice, active voice