I was listening to McCain 's nomination acceptance speech on the radio on the way to the airport yesterday and it sounded so different than it did in the arena . I actually got to hear the fiery end to the speech , the part where he said : Stand up , stand up , stand up and fight . Nothing is inevitable here .

Available choices:
A). Because McCain was having trouble with his voice ..
B). Because of the trouble with the microphone ..
C). Because of the acoustics in the arena ..
D). None of the above choices ..
Q: Why did the speech sound so different ?
C).