Question

which number is a composite number
A.1
B.2
C.7
D.9

Answer 1

I think D (9) !!!!!!!!!!

Answer 2

A composite number  is a positive integer  which is not prime (i.e., which has factors other than 1 and itself). The first few composite numbers are 4, 6, 8, 9, 10, 12, 14, 15, 16, ...  
So it would be D.9