The sides of an equilateral triangle are increasing at the rate of $2 \text{ cm/sec}$. The rate at which the area increases,when the side is $10 \text{ cm}$,is
- A$10 \sqrt{3} \text{ cm}^2/\text{sec}$
- B$20 \sqrt{3} \text{ cm}^2/\text{sec}$
- C$5 \sqrt{3} \text{ cm}^2/\text{sec}$
- D$2 \sqrt{3} \text{ cm}^2/\text{sec}$
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