Hello can someone please help me please?

Question:What is 4/5 of 10/13? Put your answer in lowest terms.

Answers: A.40/45 B.5/18 C.8/13 D.20/65

I would have an estimated guess but I honestly don't know what it is.

Thank you~~~~~fawn

in math, "of" means multiply. So,

4/5 * 10/13 = 40/65 = 8/13