What is the frequency of the white flower color allele in this population of snapdragons if In snapdragons, there are two alleles for flower color, red flower color (R) and white flower color (r)? The heterozygotes have pink flowers. In a particular population of snapdragons, 81% of the flowers are red.

A. 0.1
B. 0.3
C. 0.5
D. 0.9