B. THE MAIN CONTEXT CLUE IS THE WORD NERVOUS. IF THE SPEAKER IS NER...

1. b. The main context clue is the word nervous. If the speaker is nervous, his voice would not be boom-ing confidently (choice a). It is possible that he whispered (choice c), but because of the context, it ismore likely that his voice was trembling. Choice dis meant to mislead, since quacking sounds like qua-vering, but there is no reason to expect that he would be quacking like a duck.