According to bartolomé de las casas:
a. spain needed to institute a more humane system of native american slavery in order to avoid offending pope paul iii.
b. converting native americans to anything but catholicism would lead to their death.
c. spain had caused the deaths of millions of innocent people in the new world.
d. despite his opposition to slavery, he needed to keep his slaves so that he would have time to devote to working for abolition and emancipation.
e. slavery needed to be eliminated entirely from the earth.

c. Spain had caused the deaths of millions of innocent people in the New World.

Explanation:

Bartolomé de Las Casas strongly opposed violence towards Native Americans and did not understand how was it possible that God let them suffer in such way. While others considered that God gave the New World to Europeans so that they could unleash a war against heretics who worshiped other figures, he thought that it was a test to show how Spain could teach through mercy. But evidently, Spain completely failed such a test.

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the branch of biology that deals with the normal functions of living organisms and their parts.

the way in which a living organism or bodily part functions.