V = (π/6)d³ ≈ 212,067.2 ft³
The appropriate selection is
B) 212,067.2 cubic feet
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Because this is a 7-digit number and your value of π is only accurate to 3 digits, it is actually wrong. The real number is 212,174.8 ft³. I do wish your math problems got better editing. There's really no point to learning bad math.