I don't completely understand the question
A nun should be modest, had to have poverty, and pity. Chaucer describes the nun in the opposite way to show us, how the nun Prioress had all the characteristics that a nun should not have. She was a nun modest, well educated and with good manners.
The correct answer is D. It cannot stand alone as a sentence.
Explanation
Dependent clauses are incomplete sentences composed of a subject and a verb and are characterized by not expressing a complete idea. Dependent clauses must be related to an independent clause to make sense of it. The independent clauses are sentences composed of a subject and a verb, in addition, unlike the dependent clauses, they express a complete idea. Therefore, the correct answer is D. It cannot stand alone as a sentence.
I think is the letter
B. it relates the idea of separation of church and government