A hollow right prism of equilateral triangular base of side 4cm is filled with water up to a certain height. If a sphere of radius $\frac{1}{2}$cm is immersed in the water, then the rise of water is

A. 1cm
B. $\sqrt{\frac{3\pi }{24}}$
C. $\frac{\pi }{24\sqrt{3}}$  
D. 24$\sqrt{3}$

Show Answer Show Explanation

Correct Answer: C