The correct option is C 8
We can find the factors of 16 by finding the factor pairs of 16.
The factor pairs of 16 are:
1 x 16 = 16
2 x 8 = 16
4 x 4 = 16
8 x 2 = 16
16 x 1 = 16
Thus, the factors of 16 are: 1, 2, 4, 8, 16
Hence, the missing factor is 8.