What was a source of political turbulence in the medieval period

Which sentence in this excerpt from the time machine suggest that the time travelled will later realize that his assumptions about future society are incorrect

Which of these statements about the cpp supports the sub-claim that it cleans the air? a. the cpp cuts particle pollution, nitrogen oxides, and sulfur dioxide by more than 25 percent. b. the cpp avoids up to 6,600 premature deaths. c. the cpp cuts electricity bills roughly 8 percent. d. the cpp provides americans with reliable and affordable power.

Ineed simplifying this thesis and making it easier to understand for the reader (more concise) "no matter how religious one may be, one’s faith tends to change under unexpected and challenging circumstances."