At what size and how far above the ground should an opening in a buildings shell be protected?

At what size and how far above the ground should an opening in a buildings shell be protected?
A . Reinforce or secure any openings in the building shell that measure more than 96 square inches (619 centimetres) and are lower that 18 feet (5.5 metres) above the ground.
B. Reinforce or secure any openings in the building shell that measure more than 100 square inches and are lower that 18 feet above the ground.
C. Reinforce or secure any openings in the building shell that measure more than 80 square inches and are lower that 18 feet (5.5 metres) above the ground.
D. Reinforce or secure any openings in the building shell that measure more than 96 square inches (619 centimetres) and are lower that 20 feet (6 metres) above the ground.

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Answer: A