To find the surface area of the triangular prism, we need to find the area of each individual shape on the net and then add them together.
1. The area of the middle rectangle is 10 feet (width) x 24 feet (length) = 240 ft^2.
2. The area of the two right triangles is 2 x (1/2 x 10 feet x 24 feet) = 240 ft^2 (for both triangles).
3. The area of each of the three vertical rectangles is 10 feet x 24 feet = 240 ft^2.
Adding these together, the total surface area of the triangular prism is 240 ft^2 + 240 ft^2 + 240 ft^2 = 720 ft^2.
Therefore, the correct answer is 720 ft^2.