The correct answer is A. armored, more quickly, weakest.
In the sentence, the adjective armored is used in its base form, that is to say, in its positive degree. The second modifier, more quickly, is used in its comparative degree since the use of the structure more… than signals the comparative form of the adjective. Finally, the third modifier, weakest, is used in its superlative degree because it is an adjective that compares a whole group of people, and the –est ending is the suffix that indicates the superlative form.