PT 45 S1 Q9

The use of phrases like as so-and-so said or as the saying goes suggests ... ...

Which one of the following contains an inappropriate usage of a phrase, according to the principle stated above?
(A) Fatima was a mathematician who often thought about unsolved problems of mathematics, although it was unpleasant to be reminded that most would probably remain unsolved in her lifetime. As the saying goes, "Strange how much you've got to know before you know how little you know."
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Principles: Intro Set