Pie Dough Should Be Kept Cool During Mixing and Make-Up

Pie dough should be kept cool during mixing and make-up because __________.

A) if it is too warm, gluten will develop too slowly
B) shortening has its best consistency when it is neither too warm nor too cold
C) a butter-based dough will turn rancid very quickly if its temperature is too high
D) the salt in the dough will keep the shortening and the flour from mixing properly at high or low temperatures