The given sentence is in active voice: "Were you laughing at the poor masses?" To convert it to passive voice, we need to shift the focus from the subject ("you") to the object ("the poor masses"). The passive voice emphasizes the action being done *to* the object rather than *by* the subject.

Let's analyze the options:

• Option 1: "Are the poor masses being laughed at by you?" This uses the present continuous passive, implying an ongoing action. The original sentence is in the past continuous, so this isn't the correct tense.
• Option 2: "Have the poor masses been laughed at by you?" This uses the present perfect passive, indicating an action completed at some unspecified time in the past. This doesn't match the original sentence's past continuous tense.
• Option 3: "Were the poor masses being laughed at by you?" This is the correct answer. It uses the past continuous passive, perfectly mirroring the tense and structure of the original active sentence. The action of laughing at the poor masses was ongoing in the past.
• Option 4: "Had the masses been laughed at by you?" This uses the past perfect passive, suggesting an action completed before another action in the past. This doesn't align with the original sentence's tense.

Therefore, the correct passive voice transformation maintains the past continuous tense and focuses on the action being performed on "the poor masses," resulting in "Were the poor masses being laughed at by you?"