Answer:
She has been chosen to sing in tonight’s concert.
Step-by-step explanation:
Active voice of tense is when the subject does the action which the verb stated. In most cases we use active voice.
I made a cake.
Passive voice is used when we want to emphasize the action, not the subject of the sentence or when we do not who the subject is. We build passive voice by adding a past participle of a certain verb to a form of auxiliary verb (depending on needed tense).
Cake was made (by me - not important).
Regarding all said above, in sentences 1, 3 and 4 is used active voice of a tense. Only in sentence 2 (She has been chosen to sing in tonight’s concert.), we can notice the passive voice, so that is the correct answer.