Answer:
c. 57
Step-by-step explanation:
A composite number is a number that has more than 2 factors.
a. 47 has only two factors which is 1 and 47, thus it's not a composite number
b. 53 has only two factors which is 1 and 53, thus its also not a composite number
c. 57 has 4 factors, thus 57 is a composite number
