'Heartstring' is a phrase used by Princeton Review
to explain such questions.
Some sentences/CR takes provides information which are viewed by a reader with his opinion impossed on the topic.
for eg : Julia Roberts is very beautiful.
Now, this sentence states something which is of common knowledge. The paragraph may not state this information. But since this is a common knowledge to us, we tend to get pulled to this answer choice.
calls this as 'heartstrings'. Hope my explanation was worth while. Thanks