How many tennis balls will fit within the interstitial holes between a truckload of basketballs perfectly placed in a closest-packed arrangement? Assume that the tennis balls have a radius that is 20% that of a basketball.
A) equal number of tennis balls and basketballs
B) twice as many tennis balls as basketballs
C) three times as many tennis balls as basketballs
D) four times as many tennis balls as basketballs
E) five times as many tennis balls as basketballs
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