Consumer magazine: Because front-loading washers use less water than top-loading ... ...

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.

Which one of the following is an assumption required by the argument in the consumer magazine?


(A) All top-loading washing machines use the same amount of water.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in PT70 (Oct 2013): Logical Reasoning A