This is a steel frame building, non-residential. It needs R25 c.i. in the roof and R13 + R5 c.i. in the walls. Choice A doesn't have enough insulation in the walls that's c.i. Choice B doesn't have enough insulation in the roof. It has R24, but needs R25. Choice C is the only one that has enough insulation in the roof and walls. It needs R-5 or more c.i. = continuous insulation, which is not in between the studs.
Hope this helps!
Rebekka O'Melia, R.A., NCARB, B. Arch, M. Ed, Step UP ARE 5.0 Courses
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