In the year 2500, five male space colonists and five female space colonists (all unrelated to each other) settle on an uninhabited Earthlike planet in the Andromeda galaxy. The colonists and their offspring randomly mate for generations. All ten of the original colonists had free earlobes, and two were heterozygous for that trait. The allele for free earlobes is dominant to the allele for attached earlobes. Question: Over time, the movement of people on Earth has steadily increased. This has altered the course of human evolution by increasing
a) a non random mating
b) geographic isolation'
c) genetic drift
d) mutations
e) gene flow