He has implicated them in the conspiracy.

interested
involved
affected
influenced

The correct answer is B. involved.

To implicate someone in something means to involve them in it, especially in a way that makes them look guilty. In this case, the speaker is saying that the person they are talking about has been involved in a conspiracy.

The other options are not correct because they do not accurately describe the meaning of the word “implicate.” Option A, interested,

means to have a strong interest in something. Option C, affected, means to be changed or influenced by something. Option D, influenced, means to be persuaded or controlled by someone or something.

In this case, the speaker is not saying that the person they are talking about is interested in the conspiracy, or that they have been changed or influenced by it. They are saying that the person has been involved in it.