Answer:
Correct answer are
A. Conquest of Caribbean Islands for the purpose of spreading the Catholic religion.
D. The worldwide redistribution of plants, animals, and diseases.
Explanation:
A is correct because the Catholic church was losing its influence in Europe due to Reformation, so wanted to strengthen its role in the New World.
D is the correct answer because many new cultures and animals were introduced in that period. Coffee, tobacco, potato and many other products were exchanged. Of course, that changed the diet of people on both European and American continent. The bad effect was that Europeans brought many diseases that killed millions of Native Americans.
Of course, this is why B is wrong. Population didn't increase, but decreased because of this process.
It also goes with C. Biodiversity was a good, and not a a bad effect.