C: In my opinion, overall is ok. The writer selects the words are easy to understand. Would anyone like to comment?
B: I think this paragraph is quite easy to follow and it will be one of the good paragraphs if the author has a clear topic sentence and clear concluding sentence.
A: And also the signal words.
D: So, we have decided that this paragraph is the good one but the writer should highlight the paragraph structure and use signal words.