Two frog populations (same species) living in two neighboring lakes sing slightly different courtship songs. Increased irrigation makes the land between the two lakes wetter, allowing frogs to expand their ranges to the area between the lakes. Females in both populations prefer loud frogs to quieter frogs but do not distinguish between the two slightly different songs. Assuming that courtship song differences are due in part to genetic differences, predict what will likely happen to the songs of the two frog populations.

a. The gene flow between hatchery-reared and wild populations is leading to a decline in fitness of wild populations.
b. The gene flow between hatchery-reared and wild populations is neither helping nor hindering the fitness of the wild population.
c. This data does not help us understand effects of gene flow on fitness. The gene flow between hatchery-reared and wild populations is increasing the fitness of the wild populations.
d. You cannot predict a change in the courtship songs at the two lakes.