What end mark should be added to the bold word to make it an exclamation?

Plagiarism can be avoid by a. copying and planting articles found online b.using language directly from outside resources c.using mla format to cite source d.changing a few words when quoting another writer

Which situation might occur in a conflict of character versus nature? a. a society disapproves of a character’s behavior. b. a character suffers from a serious illness and eventually dies. c. two characters argue over a difference of opinion. d. a character is unable to decide on his opinion of another character.

According to stephen hawking in the "origin of the universe" lecture, "why are we here" and "where did we come from" are questions that