Something doesn’t have to be a flat out “no” or “not" to be wrong—it can be something that’s slightly off. Our natural tendency is to read the part of the answer choice that sounds good and not really pays attention to the part that’s somewhat wrong.

For instance, if a passage discusses the main character’s insight that he can’t always trust his friend because his friend sometimes unintentionally misinterprets what he says, a wrong answer choice might be phrased like this:
"The main character realizes that his friend is untrustworthy because he isn't a good listener."