Apyramid has a square base with side s. the height of the pyramid is that of its side. what is the expression for the volume of the pyramid

We know that the volume of a pyramid is (1/3) of the product of the given area of the base and the height. A pyramid has a square base with side s. The height of the pyramid is that of its side.  

Volume = (1/3)*side(s)^2 * (2/3)*side(s) = (2/9)s^3 

Ithink the answer is b

Im pretty sure it’s is b 1.6 mi