A population of tree-climbing lizard live on one bank of a large river. The other bank of the river is a treeless prairie. During a flood, 40 lizards were transferred to the prairie side of the river. After 200 generations, this transferred population of lizard lost the ability to climb. Which mechanism is MOST likely responsible for this loss of function within the transferred population?
A) mutation
B) genetic drift
C) natural selection
D) gene flow