Guppies from Trinidad Form Two Distinct Populations That Differ in Several

Guppies from Trinidad form two distinct populations that differ in several life history traits. These traits appear to relate to the local predator populations, pike-cichlids or killifish. Which experiments would best test the heritability of these traits?

A) Raise both populations with cichlids to see if the population of smaller, faster-maturing guppies reproduces more quickly.
B) Raise both populations without predators to see if they maintain their life history traits.
C) Introduce cichlids into a habitat with killifish.
D) Provide additional food to the guppies from cichlid habitats to see if they will grow to the same size as guppies from the killifish habitat.