In Order for the Scientists to Artificially Select Drosophila for Their

Multiple Choice

In order for the scientists to artificially select Drosophila for their number of bristles,

A) they had to induce mutations into their populations of Drosophila.
B) they had to study the population for millions of years.
C) genetic variation had to be present in the population.
D) dramatic mutations had to be produced by the selection.