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Composites are immensely popular engineering materials because they are significantly lighter than aluminum yet 20 percent stronger. However, great care must be taken when using them because composites fatigue and fail differently from metals. In a metal, although a fatigue crack can appear at a very low stress level--about 10 percent of the metal's breaking stress--such cracks normally grow only slowly, allowing ample time to spot them before catastrophic failure. To start a crack in a composite, on the other hand, requires somewhere between 50 to 70 percent of its breaking stress. But while it is much more difficult to create the crack in the first place. it will then reach a critical size much more quickly.

It can be inferred from the passage that which of the following would best address the problem of catastrophic failure in composites?

AUsing aluminum instead of composites for parts that need to withstand high stress levels
BIncreasing the weight of parts made from composites to match that of similar aluminum parts
CEnsuring that parts made from composites are subjected only to stress levels less than 50 percent of breaking stress
DAssessing fatigue in aluminum parts to predict imminent problems with associated parts made of composites
EEnsuring that parts made from composites are inspected more frequently when they are subjected to low stress levels than when they are subjected to high stress levels

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