Can someone explain this question for me please?

purpleacorn
Tue, 18 Oct 2011 10:15:13 +0000

In this case, the object of the prepositional phrase is ‘the sounds’. The answer choice written correctly because it has a compound predicate, each with a different prepositional phrase. Thus, it’s sharpening ‘awareness of the sounds’ as well as ‘appreciation for the sounds’.