The correct answer is A ephemeral--evanescent
Both words refer to concepts that are quickly fading, last for a short time, disappear, or similar.
Here are the answers for the given clauses above:
1. <span>that uses the technique of stream of consciousness: Adjectival clause
2. </span><span>how Faulkner envisioned the world through the eyes of Benjy Compson: Adverbial clause
3. </span><span>That his sympathies were with the cook Dilsey: Noun clause
4. </span><span>Because the first section of the book is seen through the eyes of a mentally handicapped man: Adverbial clause
5. </span><span>that is worth the work : adjectival clause
6. </span><span>If you read Faulkner’s opus: adverbial clause</span>
C. The audience’s point of view is very important when selling newspapers
