Answer:
The answer is 3: Amnesia is, however, a very subtle, and sometimes sinister, illness.
Explanation:
The reason for this is because that is the topic that the author is talking about: that Amnesia is a subtle and sinister illness.
First, is this a multiple choice or an 1 answer Q?
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If you are talking about Theodore Roosevelt then what helped him was the
fact that he was from a wealthy family that didn't send him to school
but rather had him tutored at home and more or less groomed him for the
role of a diplomat. He used what he was taught by tutors to get degrees
from Harvard and Columbia which is not a small feat.