Which lists all the factors of a composite number?

Question

A) 1,3,9,27
B)1,9
C)1,2,3,4,12
D)1,11

Answer 1

Study this site.

http://www.mathsisfun.com/prime-composite-number.html

What do you think?

Answer 2

C is missing one of the factors of 12, so that can't be right.

Answer 3

I mean B because C has primes and 9 is composite cause 1x9 and 3x3?