The Number of Generations It Takes for an Allele to Become

The number of generations it takes for an allele to become fixed or lost in a population depends on population size. There are three populations associated with the frequency of the b allele and its change in frequency. Which population(s) show dramatic change in b allele frequency and what are these changes? Population 1 = brown mouse (top line) ; Population 2 = middle line; population 3 = white mouse (bottom line) .

A) Population 1; it shows an extinction of the ballele resulting in all brown mice.
B) Population 3; it shows an extinction of the ballele resulting in all white mice.
C) Population 2; it shows an increase in the frequency of the b allele after 50 generations.
D) Population 1; it shows a fixation of the ballele resulting in all brown mice and Population 3 shows . an extinction of the b allele resulting in all white mice.
E) Population 1, 2, and 3 all show drastic changes in ballele frequency after 50 generations, with the . complete elimination of the b allele in all three populations.