A writer includes the following sentences in one paragraph: 'Fast food is inexpensive. Fast food contains high levels of sodium. Fast food chains are popular worldwide. Fast food workers earn low wages.' What is the primary weakness of this paragraph?
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A
The sentences are too short.
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B
The paragraph lacks a topic sentence unifying these facts under one idea.
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C
The paragraph uses passive voice.
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D
There are too many sentences about fast food.