PLEASE HELP! Calculate the volume of the prism by first finding the total number of half-unit cubes that will fill it. There are 8 half-unit cubes in every unite cube.

A. Number of half-unit cubes = 20 V = 10 cubic units
B. Number of half-unit cubes = 20 V = 2 1/2 cubic units
C. Number of half-unit cubes = 10 V = 5 cubic units
D. Number of half-unit cubes = 10 V 2 1/2