He accused her _____ having copied another very famous advertising campaign in which the same slogan had been used.

• A. Of
• B. For
• C. To
• D. With

Answer: (A)

The main idea here is the natural verb–preposition pairing after accuse. In English, you say someone is accused of something. After of, you can use a gerund to describe the action in question, and a perfect gerund like having copied shows the action happened before the accusation. So the sentence correctly uses of having copied to indicate that the copying occurred in the past and is the accusation's target.

The other prepositions don’t fit the standard pattern. For, to, or with would not normally follow accuse in this construction, so they wouldn’t sound natural here.