WinWinMBA wrote:
The reason much refrigerated food spoils is that it ends up out of sight at the back of the shelf. So why not have round shelves that rotate? Because such rotating shelves would have just the same sort of drawback, since things would fall off the shelves' edges into the rear corners.
Which of the following is presupposed in the argument against introducing rotating shelves?
(A) Refrigerators would not be made so that their interior space is cylindrical.
(B) Refrigerators would not be made to have a window in front for easy viewing of their contents without opening the door.
(C) The problem of spoilage of refrigerated food is not amenable to any solution based on design changes.
(D) Refrigerators are so well designed that there are bound to be drawbacks to any design change.
(E) Rotating shelves would be designed to rotate only while the refrigerator door was open.
The conclusion here is that
the rotating round shelves wouldn't work because food would fall into the cornersNow let's apply the negation technique.
We will negate each answer choice, and the negated answer choice that DESTROYS the conclusion will be the correct answer.
(A) Refrigerators WOULD be made so that their interior space is cylindrical.
This negated answer choice destroys the conclusion that
the rotating round shelves wouldn't work because food would fall into the corners, there would no longer be any corners for the food to fall into.
Keep A.
(B) Refrigerators WOULD be made to have a window in front for easy viewing of their contents without opening the door.
This does not destroy the conclusion that
the rotating round shelves wouldn't work because food would fall into the cornersEliminate B.
(C) The problem of spoilage of refrigerated food IS amenable to any solution based on design changes.
This does not destroy the conclusion. In fact, it strengthens the conclusion.
Eliminate C.
(D) IT IS NOT THE CASE THAT refrigerators are so well designed that there are bound to be drawbacks to any design change.
This does not destroy the conclusion.
Eliminate D.
(E) IT IS NOT THE CASE THAT rotating shelves would be designed to rotate only while the refrigerator door was open.
This does not destroy the conclusion.
Eliminate D.
Answer: A
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