The root dict means "to say." which best identifies the prefix and explains how it affects meaning in the word contradict?

a. the prefix is contra- and it suggests that what is said is the opposite of something else.
b. the prefix is contra- and it suggests that this is the first point in a conversation.
c. the prefix is contra- and it suggests that a comment is nice and generous.
d. the prefix is contra- and it suggests that the comment is cruel and unfair.