I think that this means that not everyone has the same mentality, so therefore, the same event can mean different things to different people. For example, every person experiences life differently whether that be different cultures, environments, or religion. This all affects how a person develops moral, ethics and their thinking process. Also, people learn new things every day which can also influence their , already existing, mentality meaning "[their] response can change over time.
its not 200 words but i hope this helps :)
I'm not sure since I can't read the passage, but I think D is least important.
The novel to kill a mockingbird came at a crucial time in american history in which (segregation) and (racism) were fueling debates across the country.
I think it’s D. Ocean trenches
