The work that Ryan did to find the greatest common factor of 48 and 72 is shown below. Prime factorization of 48: 2,2,2,2,3
Prime factorization of 72: 2,2,2,3,3

The greatest common factor is 2 ' 2 ' 2 ' 2 ' 3 ' 3

What is Ryans error?
A: Ryan did not include all the common factors in the greatest common factor.
B: Ryan did not list all the factors in the prime factorization of 48.
C: Ryan did not list all the factors in the prime factorization of 72.
D: Ryan found the least common multiple.