The radius of a circle is increasing at the rate of $2 \text{ cm/sec}$. The rate at which its area is increasing when the radius of the circle is $5 \text{ decimeters}$ is:
- A$100 \pi \text{ cm}^2/\text{sec}$
- B$200 \pi \text{ cm}^2/\text{sec}$
- C$2000 \pi \text{ cm}^2/\text{sec}$
- D$20 \pi \text{ cm}^2/\text{sec}$
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