The possible answers are:
dominant allele frequency (p) : 0.02
dominant allele frequency (p) : 0.98
dominant allele frequency (p) : 0.08
dominant allele frequency (p) : 1.0
The frequencies of recessive and dominant alleles in the population should add up to 1. Therefore, answer : dominant allele frequency (p) : 0.98 is correct, since (0.02+0,98=1).