Answer: B. 4 inches
Explanation:
The width of the stage can be found by multiplying the width of the scale drawing by the scale factor. Since the scale is 1 inch: 7 feet, you can set up a proportion:
1 inch / 7 feet = x inches / 28 feet
To solve for x (the width of the scale drawing), cross-multiply and simplify:
7 feet * x inches = 1 inch * 28 feet
7x = 28
x = 4
Therefore, the width of the stage is 4 inches.