The minimum width of a staircase in a residential building is:

 The minimum width of a staircase in a residential building is:

 The minimum width of a staircase in a residential building is:

A. 0.7 m

B. 0.8 m

C. 0.9 m

D. 1.0 m

Answer: B

Explanation: Residential staircases require 0.8m minimum width.