Sea and oceans are full of water on earth.However, a very small percentage of water present on earth is available for us. This percentage is roughly

Question

$\begin{array}{1 1} (a)\; 0.006 {\%} \\ (b)\; 0.06 {\%} \\ (c)\; 0.6 {\%} \\ (d)\; 6 {\%} \end{array}$