39.How high is the side wall at the corners where it meets the front and back walls?A.12 ftB.10 ftC.8 ftD. 5.3 ft

Since it is given that
[tex]1\text{ in=8 ft (Scale)}[/tex]And as we can see from the figure that side wall is given 1 in high .
So the correct option would be
[tex]C\text{ . 8 ft}[/tex]