1. The problem asks what Brandon needs to calculate to find the amount of carpet to cover his floor. 2. The floor measures 6 feet by 5 feet, so it is a rectangle. 3. To find the amount of carpet needed, Brandon needs to find the area of the floor. 4. The formula for the area of a rectangle is $$\text{Area} = \text{length} \times \text{width}$$. 5. Here, length = 6 feet and width = 5 feet. 6. So, $$\text{Area} = 6 \times 5 = 30$$ square feet. 7. Volume and capacity relate to 3D space, which is not relevant here. 8. Perimeter is the total distance around the floor, not the amount of carpet needed. 9. Therefore, the correct answer is D Area.