Which sentence uses the superlative form of funny?

a.
tom made a funnier face than lynn.

b.
that poem about cats is quite funny.

c.
that is the funniest joke i've ever heard.

C. because the superlative form of funny is funniest.

I believe the answer is C, because superlatives have suffix with est at the end

The big bang theory suggests that the universe is constantly expanding and that stars, galaxies and other entities are moving away from each other. if there were a galaxy moving closer to earth then that would contradict the big bang theory since the entities should be moving away from earth and from each other.