A topic sentence is A sentence that starts a paragraph and sums up what the paragraph will be about. Thus, option "B" is correct.
The topic sentence should state the main idea/the main topic that the writer wished to convey through the writing. So it would be very effective to put it on the first sentence of an excerpt
The topic sentence is the main focus, the controlling idea is your opinion about the topic {sentence}.
Thus, option "B" is correct.
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