This question requires converting a sentence from active to passive voice, specifically focusing on the present continuous tense. The original sentence, "They are watching a movie," is in the active voice, present continuous tense (Subject + am/is/are + present participle + Object).
To convert a present continuous active sentence into passive voice, the structure is: Object + am/is/are + being + past participle + (by Subject). Here, "a movie" is the object, which becomes the subject of the passive sentence. Since "a movie" is singular, it takes "is." The continuous aspect is maintained by "being," followed by the past participle of "watch," which is "watched."
- A: "A movie is watched" is incorrect because it uses the simple present passive tense, losing the continuous aspect.
- B: "A movie was being watched" is incorrect as it uses the past continuous passive tense, changing the original tense.
- D: "A movie has been watched" is incorrect because it uses the present perfect passive tense, altering both the tense and aspect.
Therefore, C: "A movie is being watched" is the correct passive voice construction, accurately reflecting the present continuous tense of the original sentence.