Respuesta :
The sentence among the options that shows a cause/effect relationship is "I needed to pass the test, so I studied really hard the night before." (option D)
Cause/effect relationship
When a sentence shows a cause and effect relationship, one of the clauses will present the cause or reason for something, whereas the other will show the effect or result of that cause.
The conjunction "so" is used to introduce the clause the presents the effect. As we can see in letter D, the cause is the test. The effect of the existence of the test is the speaker's studying hard.
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