Final answer:
The riser height of the stairway is approximately 5.9 inches, which does not fit into any of the provided options. The closest range given is 4-5 inches, but it is important to note this is not the exact match for the given step height.
Step-by-step explanation:
The question is asking about the range of riser height for a stairway, which is the vertical distance between the surfaces of adjacent steps. Based on the information provided, we can determine that the height of each step (riser) is 15 cm, which is approximately 5.9 inches. Therefore, when looking at the options provided, none of them correctly states the range of the riser height since 15 cm does not fall within any of the given ranges. However, if we consider the options as not accurately representing the heights in inches, the closest provided range would be 4-5 inches. But it is important to note that this is not the precise height indicated by the initial measurements.