The phrase from the excerpt that suggests that Krogstad is prone to engage in crime and may, in fact, be a criminal is the following one:
diseased moral character
It is the only option that talks about somebody being a bad person, which is what Krogstad is. The other options do not show that moral ambiguity this option does.
This sentence is an example of an idiom
they believe all people could do Individualism
Family can be defined as agroup of people who are related by blood, marriage and adoption. '
They include father, mother, son and daughter.
Your answer would be:
C. Demonstrate the importance of being responsible and making connections with others.
I apologize if this is incorrect,
-Anime