Select the option that expresses the given sentence in passive voice.

They flew a kite in the evening.

A kite was flown by them in the evening.

The correct passive voice form of the sentence "They flew a kite in the evening" is A kite was flown by them in the evening.

The active voice of the sentence is "They flew a kite in the evening." This sentence is in the simple past tense, which is used to describe an action that happened in the past. The passive voice of the sentence is formed by putting the subject of the active sentence after the verb "to be" and the past participle of the main verb. In this case, the subject of the active sentence is "they" and the main verb is "fly." The past participle of "fly" is "flown." So, the passive form of the sentence is "A kite was flown by them in the evening."

The other options are incorrect because:

• A kite was being flown by them in the evening. This sentence is in the present progressive tense, which is used to describe an action that is happening now but is not finished. However, the action of flying the kite happened in the past.
• In the evening, a kite have been flown by them. This sentence is in the present perfect tense, which is used to describe an action that has happened in the past and is still relevant to the present. However, the action of flying the kite is not happening now.
• A kite has been flown by them since evening. This sentence is also in the present perfect tense, but it implies that the kite has been flying since the evening. This is not the case, as the sentence states that the kite was flown in the evening.