Question ID:PT12 S4 Q20 Passage:A new gardening rake with an S-shaped handle reduces compression stress on the spine during the pull stroke to about one-fifth of what it is with a straight-handled rake. During the push stroke, however, compression stress is five times more with the new rake than with a straight-handled rake. Neither the push stroke nor the pull stroke with a straight-handled rake produces enough compression stress to cause injury, but compression stress during the push stroke with the new rake is above the danger level. Therefore, straight-handled rakes are better than the new rakes for minimizing risk of spinal injury. Stem:The conclusion above is properly drawn from the premises given if which one of the following is true? Correct Answer Choice:AChoice A:Compression stress resulting from pushing is the only cause of injuries to the spine that occur as a result of raking. Choice B:Raking is a frequent cause of spinal injury among gardeners. Choice C:The redesign of a tool rarely results in a net gain of efficiency, since gains tend to be counterbalanced by losses. Choice D:A garden rake can never be used in such a way that all the strokes with that rake are push strokes. Choice E:It is not possible to design a garden rake with a handle that is other than straight or S-shaped.