Asingular subject takes a what kind of verb

Which two phrases in this information about medicare prescription drug coverage are noun phrases

How does visiting the place of the gods affect the narrator? a. he discovers that it is unwise to have an inquiring mind b. he learns that there is nothing supernatural to fear in the destroyed city c. he renounces everything he learned from the priests and his father d. he understands that the past has nothing of interest for people of the present

Give an example of one of the choices from the question above. explain what makes your example fit into this classification. use complete sentences, proper grammar, spelling and capitalization.