GMAT Critical Reasoning (CR) | Re: Climatologists believe they know why Earth has undergone a

To support the climatologists' hypothesis, you need to connect the Earth's passage through dust to the lowering of temperatures that characterises the ice age(s). C says that large amounts of dust (from wherever) have in the past caused drops in the Earth's average temperature. So there's reason to believe that this pattern might be evidenced with cosmic dust as well.

D, on the other hand, provides no such correlation. D doesn't suggest that sometimes those large rocks create dense enough