What he tells me confirms my ideas.

Answer: Option C

confirms : establish the truth or correctness of (something previously believed or suspected to be the case).
strengthens : make or become stronger.
opposes : disagree with and attempt to prevent, especially by argument.
contradicts : deny the truth of (a statement) by asserting the opposite.
verifies : make sure or demonstrate that (something) is true, accurate, or justified.


Antonym of confirms is contradicts