On dropping a stone in stationary water,circular ripples are observed. The rate of flow of ripples is $6 \text{ cm/sec}$. When the radius of the circle is $10 \text{ cm}$,the rate of increase in its area is:
- A$120 \text{ cm}^2/\text{sec}$
- B$60 \pi \text{ cm}^2/\text{sec}$
- C$10 \pi \text{ cm}^2/\text{sec}$
- D$120 \pi \text{ cm}^2/\text{sec}$
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