... can think of "few cowards fail to be fools" as some ... are not." So "few cowards fail to be fools" would translate ... as "most cowards do not fail to be fools," which would ...
The answer choice (A) is an assumption that justifies the conclusion, but potentially there could be other reasons. So (A) is a sufficient assumption for the conclusion, not a necessary one.
Yes, I overstated it by saying the conclusion is justified. It is what the question refers to it as - a principle underlying the conclusion. I guess you can look at it as 'pseudo-sufficient'.
... word 'if', much like a sufficient assumption question. They also often ... traditional strengthening answer and a sufficient assumption answer (not traditional-strength ...