The revision that is the most concise way to write this sentence without losing important information is D. The river was as slow as molasses in January.
This refers to the concise representation of the main points of a text without the loss of important details.
Hence, we can see that from the given text, there is the narration of the water flowing slowly, like the molasses in January, and to make a concise revision without losing important questions, option D should be used.
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