If the Germans had managed to win D-Day it would have been at least 3 more years before the Allies could attack again in such strength.
D. They seek crops is unusual for an exploration cause.
By actively managing their food supplies, agricultural societies were able to produce more food than hunter-foragers and support denser populations. Having a large population nearby made it worthwhile for farmers to grow more food than they needed for themselves, as they could trade this surplus for other goods.
Erasmus wanted everyone to be able to read the Bible. His arguably greatest accomplishment was his translation of the New Testament. Erasmus wanted the Bible to be publically available in every language. A is the correct answer.