After a forest fire, there was a severe drop in the population size of koala bears. Which of the following describes the gene pool of the remaining survivors? A) A selective process caused an increase in the population's genetic variation.
B) The founder effect caused the chance event that altered the allele frequency.
C) Bottleneck effect led to over-representation of certain alleles in the new gene pool decreasing genetic diversity.
D) Gene flow led to an increase in the gene pool's allele frequencies.