Which of the Following Situations Leads to Microevolution

Multiple Choice

Which of the following situations leads to microevolution?

A) An individual bird has a beak of a particular size that grows larger during a drought.
B) Mutations in muscle cells are transferred to the next generation.
C) Alleles move between populations that differ in allele frequencies.
D) All individuals within a population have the same allele at a particular locus.