Ramina found the length of two pieces of ribbon to be 47.6 inches and 39.75 inches. Which is an effective estimation strategy for finding the sum of the two lengths?

For a quick estimate, round each length to a nearby easy number: 39.75 rounds to 40, and 47.6 rounds to 48. Then add 40 + 48 = 88 inches. Choice B uses this effective estimation strategy; subtracting the lengths would not estimate their sum.

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