Answer
b. 16
Work Step by Step
To figure out the chromosome combination possibilities in the gametes, you would take 2 and raise it to the power of n; the value of n is the haploid number. Since the diploid number of a fruit fly somatic cell is 8, the haploid number (value of n) would be 4. So you would take 2 raised to the power of 4, and you get 16.