In explanation to the question 47, the 5lb book says the 3rd statement is correct because: "...if the forms are more complex then one might think, it follows that some find the forms simpler then they really are."
"More complex then one might think" does not equate "some do find them simpler then they are".
In the quote on the left, the author states: "I guess some people might think that way."
In the quote on the right, the author states: "I'm certain some people do think that way."
Would you agree or not?