The sentence that is focused enough to be a good topic sentence for a paragraph is option B which is Studying with a group offers several advantages over studying alone because it gives the main idea of what the passage is likely to entail.
Topic sentence refer to the sentence that occur at the beginning of the paragraph which contain or comprises of the main idea or the main points of what the whole passage is all about.
It suggest the over all theme and gives a brief introduction about the passage.
Therefore, The sentence that is focused enough to be a good topic sentence for a paragraph is option B which is Studying with a group offers several advantages over studying alone because it gives the main idea of what the passage is likely to entail.
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