Answer:
D. commentary that connects the evidence to the reason.
Step-by-step explanation:
Option D is the correct answer.
This is because an effective paragraph usually focuses on the main point and usually contain sentences that are are related to the subject matter. But they are given in order to expand.
The commentary that actually connects the evidence with the reason will improve the paragraph's effectiveness and give more explanation on the evidence. At the same time, the paragraph's main idea must not be eliminated in the course of the writing the paragraph.