Futuyma and Colleagues (1995)demonstrated That Host Shifts by the Herbivorous

Futuyma and colleagues (1995) demonstrated that host shifts by the herbivorous leaf beetles of the genus Ophraella in feeding on members of the sunflower family are due to the ________.

A) frequency-dependent selection properties among beetle populations
B) low mutation rate observed in beetle populations
C) need for populations to maintain sufficiently large sizes on a small number of hosts
D) availability of genetic variation sufficient for evolutionary change