Web Analytics

Which is the hypothesis of this statement?

If a and b are negative, then a + b is negative.

AIf a and b are negative, then a + b is negative.
BIf a + b is negative, then a and b is negative.
Ca and b are negative. <---
Da + b is negative.

Because D is the conclusion, and that's the only part left. I don't have a better explanation, I'm sorry, I can't really explain why I think that's the answer. :)