What is the minimum width allowed for stairs?

The minimum width allowed for stairs, particularly in residential buildings, is established to ensure safety and accessibility. A width of 36 inches is required to provide adequate space for individuals to ascend and descend without obstruction. This width allows for the comfortable passage of people, including those who may be carrying items or need assistance. It also helps to accommodate emergency situations where quick egress might be necessary.

While the other options suggest widths that exceed the minimum requirement, they are not mandated as the baseline for stair dimensions in the code. Wider stairs could enhance comfort and accessibility, but the minimum standard is explicitly defined to balance safety, practicality, and compliance with the code. Thus, a width of 36 inches is the correct answer as it aligns with established guidelines for residential stair construction.