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I would have said insufficient information to agree with E) - but its on the right track. You need to know how much time he has each pin in his hand - this will give you the minimum acceleration needed to loft each pin into the air.
If he exceeds the minimum acceleration by a large enough factor he would make it across. For example he throws a pin 500 yards in the air - smoothly - then does the same to three more pins - walks across simply holding the fifth pin - which if he wants he could launch once he's on solid ground - before the first has yet descended. If the bridge is short enough and he is fast and powerful enough - he makes it!
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