Answer:
D
Step-by-step explanation:
Hey There!
So the first thing we want to do is find the volume for a rectangular prism

volume = height x length x width
so to find the volume of this prism we do

If you plug that into a calculator you get that the volume of the prism is 1 1/2
Now we want to find how many half unit cubes there are
It says that there are 8 half unit cubes in every unit cube
So to find the amount of half cubes we multiply 8 by 1 1/2
=12
So we can conclude that the answer to this problem is D
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