The image shows the net of a rectangular prism. So, the answer is A.
A rectangular prism has six faces, all of which are rectangles. The net of a rectangular prism is made up of six rectangles, which are folded together along the dashed lines to form the prism.
The other options are incorrect:
* A cube has six faces, all of which are squares. The net of a cube is made up of six squares, which are folded together along the dashed lines to form the cube.
* A triangular prism has five faces, three of which are triangles. The net of a triangular prism is made up of five triangles and two rectangles, which are folded together along the dashed lines to form the prism.
* A rectangular pyramid has five faces, four of which are triangles and one of which is a rectangle. The net of a rectangular pyramid is made up of four triangles and one rectangle, which are folded together along the dashed lines to form the pyramid. Option A is the correct choice.