Consider a hypothetical locus with several segregating alleles.
if the population size is small, mutation is absent, and none of the alleles has a selective advantage, which of the following is likely to occur after a long period of time (many generations)?

a. allele frequencies will change over time, but both alleles will remain.
b. allele frequencies will cycle over time.
c. the population will eventually become monomorphic for one of the two alleles.
d. none of these.