Part a: which of the following best describes the central idea of the article?

a
humans are evil by nature and must actively do good in order to resist their evil impulses.
b
the trolley problem does not accurately reflect human nature because there is no right answer to the problem.
c
biases affect how people value others, but awareness can reduce unequal treatment.
d
society places value on people based on how well they can make tough choices for the greater good.