The antonym of this word is A. a follower.
When you say dissident meaning a person who loves to oppose everytime.
A provider, a protester and a contender are all synonyms of this word. A follower thus is the antonym of it because a follower never opposes. It always follows.
I am here to tell you that you should absolutely do the work yourself and that there is no way in tarnation that you should use any essay-writing services on the Internet, then translate it to Chinese then back to English. You need to just write it yourself and not do what I just said not to do.
The subject is understood in 'C'.
The complete sentence, including the subject, would have
been "<em><u>You</u></em> shake it well before pouring...".