The sides of an equilateral triangle are increasing at the rate of 2cm/sec.The rate at which the area increases ,when side is 10cm is

Question

$\begin{array}{1 1} (A)\;10cm^2/s \\ (B)\;\sqrt 3cm^2/s \\ (C)\;10\sqrt 3cm^2/s \\ (D)\;\frac{10}{3}cm^2/s \end{array}$