Given a Multistory Building with a Floor- To- Floor Height

Multiple Choice

Given a multistory building with a floor- to- floor height of 10 ft and an optimal riser height of 7 in., how many treads would you use for a U- shaped stair with a midlanding between floors? (The landing is not counted as a tread.)

A) 15
B) 16
C) 17
D) 18
E) None of the above