I'd say an important takeaway from this question is...

Just because someone said something doesn't mean the content of what they said was true but rather that the fact that they said it is what's true.

Ex: (B) Scientists claim that aliens are real.

• What is true about this answer choice is that scientists made the claim.

• What we CANNOT assume is that aliens are real.

A simple way to put it is when using the Process of Elimination strategy for this question:

"Many" is defined as more than "some." It's NOT equivalent to "most" but can be considered equivalent to "some."

(C) At least one -> "some" (correct)

(E) Most (incorrect)

For those wondering why they got Q3 wrong it's because it starts with "The only" which is actually a sufficient indicator. If it started as "Only" then it would have been a necessary indicator. Hope that helps :)