Which could be the area of one lateral face of the triangular prism?
A triangular prism. The rectangular sides are 8 feet by 2.5 feet, 8 feet by 6 feet, and 8 feet by 6.5 feet. The triangular sides have a base of 2.5 feet and height of 6 feet.

[Not drawn to scale]
7.5 ft2
15 ft2
20 ft2
39 ft2