He has implicated them in the conspiracy.

A. interested

B. involved

C. affected

D. influenced

Answer: Option B

Solution(By Examveda Team)

Interested : showing curiosity or concern about something or someone; having a feeling of interest.
Involved : cause to participate in an activity or situation.
Affected : influenced or touched by an external factor.
Influenced : have an influence on.
Implicated : show (someone) to be involved in a crime.

Synonym of Implicated is Involved