Gas is being pumped into a spherical balloon at the rate of $30 \ ft^3 / \text{min}$. The rate at which the radius increases when it reaches the value $15 \ ft$,is:
- A$\frac{1}{30 \pi} \ ft / \text{min}$
- B$\frac{1}{15 \pi} \ ft / \text{min}$
- C$\frac{1}{20} \ ft / \text{min}$
- D$\frac{1}{25} \ ft / \text{min}$
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