In Studying a Tiny Nematode Worm, Scientists Found Differences in Egg

In studying a tiny nematode worm, scientists found differences in egg number, egg size, and body mass when the worms were tested at two temperatures.At 12°C, but not at 24°C, the nematodes showed a negative correlation between egg size and egg number.At 24°C, they found a positive correlation between egg size and body mass.They also found genetic correlations for these traits, which varied in the same direction as temperature.What is the strongest conclusion that can be drawn about the contributions of environment and genetics to life history in these nematodes?

A) Genetic differences alone determine expression of these three traits.
B) Environment is the determining factor in genetic expression of all three traits.
C) Environment and genetics are equally important in causing expression of the three traits.
D) Genetics and environment interact to determine expression of the three traits, but their relative importance is not clear.
E) Genetics and environment interact to determine expression of the traits at lower temperatures, but not at higher temperatures.