GAUSS7 2010 Problem 8

Past Contests GAUSS7 GAUSS (GR. 7) - 2010
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1

How many 1\:cm\times1\:cm\times1\:cm blocks are needed to build the solid rectangular prism shown?

Image

Answer Choices
A. 10
B. 12
C. 33
D. 66
E. 36