math

What is the length of wall studs when the finished floor-to-ceiling height is 8′, ceiling material is ¾″ thick, the finished floor is ¾″ thick, and it's framed with three plates?
A. 7′9″
B. 8′1½″
C. 8′
***D. 7′7½″

My instructor told me the value of the plates is 1 1/2". So, the answer I think is D, would you agree?

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