A New Warehouse Complex Wants to Add Offices to an Upstairs

A new warehouse complex wants to add offices to an upstairs mezzanine. The head clearance for the mezzanine would be 92 inches. There is only enough room to put in a 24 inch staircase. The building department won't approve the final plans. What is the possible cause?

A) Mezzanine's can't be added in a warehouse after the fact.
B) Offices aren't allowed over warehouses.
C) There is not enough height for the offices.
D) The staircase isn't wide enough.