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I think perhaps what xelasnave said could have a interesting effect upon the answer. Since in this respect, force is going to be transferred into weight upon the bridge, throwing the pins higher would require more force. Therefore, a larger reaction would occur on the bridge. If the juggler threw even a single pin high enough, he could theoretically exceed the bridge's safe load rating.
Perhaps the answer is neither D nor E, but A; because we require to know how much force the juggler is placing upon the pins.
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