Ineed the mega big super ultra ultimate super smash bros

B

eliminate one choice each

we start with A

no immagration occured in the process

the question didn't tell you that they were originated from another place or something like that

the second choice B

well, the people that survived are from one allele so i think it is the choice

the third choice

it didn't say the population was small in number,but the purple all individuals are dying.However, the population may inctease due to the abnormal fertility of red allele individuals

the fourth choice

well, no mutation occur he didn't mention?change in Alleles or one individual with strange genetic features has suddenly appeared

i think the answer is b.