Answer:
The best choices from the options, to be able to answer the question: How did European contact impact indigenous peoples, would be:
B: Native tribes became ill from diseases that were not present until the arrival of Europeans. This is correct as it was not until Europeans arrived in America that such diseases as smallpox, or chickenpox, made an appearance, decimating thousands of Native Americans all over the Americas. It is now known that the arrival of diseases brought by the European settlers was one of the biggest impacts that Europe had on America.
C: Early European settlers attempted to convert Native tribes to their religion. This is especially true for all those tribes who came into contact with the Spanish conquistadores. One of the reasons why the discovery of new lands was supported originally by the Spanish crown, was the desire for the extension of the Gospels. When Columbus found these new lands, and the "savages" in them, a whole movement of Christians, particularly Catholic orders, began to move into the Americas in order to bring the Gospel. Later, with the arrival of the English in America, although at first evangelization was not the main purpose, but rather to find a new place away from religious persecution, it later did become an issue, with Puritans attempting to "civilize" the Indians through religious knowledge. After them, many of the new protestant movements made it their goal to evangelize the savage Native people of the colonies.
None of the other choices is correct, as Europeans traded with Indians for goods, not lands, and since lands were sacred to Indian tribes, they would have never traded them. Also, crops like bananas, coffee, sugar cane and wheat, were brought by the Europeans into the Americas, not taken from the Americas by the Europeans.