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Spherical Balloon

GRE-CG1FX5

A spherical balloon is 6 inches all the way across. How much air can the balloon hold when it's completely full?

A

$12 \pi \text{ in}^3$

B

$48 \pi \text{ in}^3$

C

$288 \pi \text{ in}^3$

D

$144 \pi \text{ in}^3$

E

$36 \pi \text{ in}^3$