An Agriculture Lab Is Trying to Improve a Type of Tomato

An agriculture lab is trying to improve a type of tomato so that it produces large fruits even under very hot,dry conditions.To do this,they must first identify the genes responsible for the tomato's response to temperature and moisture.Which experimental approach would be most helpful in doing this?

A) Comparing the target tomato's genome with those of all tomatoes having large fruits
B) Comparing the target tomato's genome with that of a mutant having all desired characteristics
C) Locating other plants that grow at high temperature and low moisture levels and looking for unusual genes
D) Growing the target tomato at a variety of temperature and moisture levels and planting several generations of seeds from the largest fruits
E) Growing the target tomato at a variety of temperature and moisture levels and planting several generations of seeds from the fruits at the highest temperature and lowest moisture levels