Read the sentence. a decision was reached by scientists about when the experiment would begin. which revision changes the sentence so that it uses the active voice? before the experiment by scientists, a decision was reached. scientists reached a decision about when to begin the experiment. a decision was reached with scientists about beginning the experiment. the beginning of the experiment is a decision that was reached by scientists

The correct option would be the second one: Scientists reached a decision about when to begin the experiment.

In ACTIVE VOICE, the "doer" of the action is also the subject of the clause. In the sentence "[a] decision was reached by scientists about when the experiment would begin", the "doers" of the action are "scientists" and the action is "reaching a decision". So the clause "scientists reached a decision (...)" is in active voice.

answer: c.   like someone who knows how to behave in public

i'm pretty sure it is 1) wants to hide her true feelings about robert. i'm sorry if it is wrong. good luck! : d