European diseases affect the Americas as They killed many people. Thus the correct option is C.
What is a disease?
A condition or illness in a person, an animal, or a plant that impacts one or more particular areas and is not simply the consequence of physical harm with the disturbance of structure or function of body is called a disease.
As Europeans transmitted deadly infections and bacteria including smallpox, measles, typhus, and cholera for which Native Americans lacked antibodies, which resulted in a number of deaths in America.
Native Americans are quickly getting contaminated with illnesses they are uninformed of as they travel by canoe along rivers to trade and exchange information.
Therefore, option C European diseases killed many people is an appropriate answer.
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