Your answer it is letter C
Answer:
so that we can choose and see the difference between good and average authors
so that more than 1 person can buy the same book
it might be A. Conspicuous or conherent ! but once again or twice research I think is good of the words and trying to see which sounds better in the blank or pretty much the sentence!
C - Beautiful antique instruments renames guitars
Appositives are nouns or noun phrases that renames another noun beside it. The phrase 'beautiful antique instruments' renames and is right beside 'guitars' as it is describing them.