Question ID:PT70 S1 Q21 Passage:Consumer magazine: Because front-loading washers use less water than top-loading washers, ordinary powder detergent does not dissolve readily in front-loading washers. So, to get clothes really clean in a front-loading machine you need to use a detergent formulated especially for front-loading washers, instead of ordinary powder detergent. Stem:Which one of the following is an assumption required by the argument in the consumer magazine? Correct Answer Choice:DChoice A:All top-loading washing machines use the same amount of water. Choice B:A laundry detergent formulated especially for front-loading washers dissolves more readily in them than it does in top-loading washers. Choice C:A washing machine gets clothes really clean only with a laundry detergent specially formulated for that machine. Choice D:A laundry detergent does not get clothes really clean in a washer unless it dissolves readily in it. Choice E:Washers that use more water get clothes cleaner than those that use less.