Answer: a) Each paragraph should have a topic sentence, support, and a concluding sentence.
Step-by-step explanation:
As stated above, the topic sentence is the sentence that describes what the paragraph will be about. This sentence is therefore the topic sentence because it introduces what the rest of the paragraph explains.
It introduces topic sentences, support and concluding sentences and then the rest of the paragraph is spent explaining these concepts. That would therefore make the above the topic sentence.