Answer: B) a rhyming couplet
Explanation: Just got the question right
I think it is C, because if I'm right present principal is something that is happening presently? If so, C would be the answer because they "are doing" the exercises right now in context.
What do we have to find here ? Hahaha
It tell you in the name fragments are bits and pieces of the whole, so sentence fragments are pieces of the full sentence.