Answer:
A) dissenter
Reason
because think about it in a definition of each word.
Trailer means- A person who betrays a friend, country, principal, ect.
loyalist means- A person who is loyal; a supporter of the existing government, especially in time of revolt.
Conformist means- A person who conforms to accepted behavior or established practices.
Dissenter means- A person who leaves something, or highly disagrees with a popular belief.