Researchers have concluded from a survey of people aged 65 that emotio

Researchers have concluded from a survey of people aged 65 that emotional well-being in adulthood is closely related to intimacy with siblings earlier in life. Those surveyed who had never had any siblings or who said that at college age they were emotionally distant from their siblings were emotionally less well adjusted at 65 than were those who had been close to at least one brother or sister.

Type - weaken
Boil it down - intimacy with siblings earlier in life --> emotional well-being in adulthood

(A) As they get older, many people think more about their mortality and thus must confront feelings of loneliness and isolation. - Irrelevant

(B) People suffering from the emotional distress of maladjustment usually remember being less intimate with other people than they actually were. - Correct; it suggests that the data is biased; people who well tend to remember the good times whereas people who are unwell tend to remember the bad times. So it may not be that intimacy leads to emotional well-being as the author concludes, but rather that emotional well-being makes memories of intimacy stand out.

(C) Memory of one’s past plays a greater role in the emotional well-being of older people than it does in that of younger people. - Irrelevant - we are not comparing old and young people here

(D) Few people can correctly identify the true sources of their emotional well-being or of their emotional difficulties. - Irrelevant because the argument does not rely on people's ability to understand why they are emotionally well/unwell. It relies only on the existence of a cause-effect relationship between intimacy in early life and emotional well-being in later life

(E) Siblings are more likely to have major arguments and deep differences of opinion at college age than at any other time of their lives. - Irrelevant