Reading essays reveals a dark side to manifest destiny. what is that dark side?

a. american imperialism
b. american slavery
c. unplanned deaths of native americans caused by disease
d. unplanned deaths of settlers from conflicts

while I may agree with the person below here, I would have to say c.

the unplanned deaths of Native Americans caused by disease

tenochtitlan (also spelled tenochtitlán), located on an island near the western shore of lake texcoco in central mexico, was the capital city and religious centre of the aztec civilization. the traditional founding date of the city was 1345 ce and it remained the most important aztec centre until its destruction at the hands of the conquering spanish led by hernán cortés in 1521 ce, which led to the final collapse of the aztec empire.

the answer is d because for c the actors can't love acting for the other's audience their not even in the same show, it can't be b either because the question is talking about the actors not the audience, and it can't be a because   it's not specific enough