Read the following sentence.The class decided if they could pool all of the money they made from the fund-raisers, they could all go on the extended field trip to San Francisco.

The class is talking about putting together the money they earned from fund-raisers so everyone can afford the trip. In this context, “pool” means to combine resources, so choice D is correct. It does not refer to a body of water, a cue game, or a swimming place.

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