The answer is the option C. The music teacher gave him a choice of horns
- for example, the trumpet, the tuba or the saxophone, because it is
correctly separating two main clauses; in this case the second clause
contains and explanation of the first one. In the options A, B and C the
dashes are splitting phrases that should not be split.
If a Caedmon were able to experience a second miracle, he would most likely react by "He would be grateful and praise God in song" although it is possible he would leave as well.
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