Personally I think it was mainly Daisy‘s fault. She did not admit to killing Myrtle although she did know. Mr. Wilson is half to blame though as he pulled the trigger. If Daisy admitted to killing Myrtle Gatsby would still be alive
The sentence in which the word <em>but </em>is used as a preposition is C) None but the brave shall enter in.
This is true because the word <em>but </em>can be replaced with the preposition <em /><em>except, </em>which means it is also a preposition.
In the rest of the sentences, <em>but </em>is used as a conjunction.
The sentence that uses a gerund phrase as a predicate noun is: My job is leading people to their seats in the auditorium. The gerund phrase used in this sentence is "leading people to their seats" and this is used as a predicate noun.
B. He argues that African Americans would have participated in more events of American history if white Americans had been willing to include them.