To solve this problem, we need to determine which box can be formed by folding the given sheet along the lines. This is a classic problem of visualizing the 2D development of a cube into a 3D shape.

Let's analyze the unfolded sheet:

The sheet shown is a net of a cube. To correctly form the cube, observe the arrangement and orientation of the faces:

1. Identify which faces will be opposite to each other when the sheet is folded into a cube.
2. Check the symbols or patterns on each face and ensure their orientation and relative positions match the options given.
3. Consider the configuration where adjacent sides in the net remain adjacent in the folded cube.

The correct option must satisfy all these conditions after folding.

Let's examine the options:

This option correctly places the faces with respect to their neighbors, considering which faces should not be seen together if they are opposite in the cube. Upon folding:

• The face with a square is opposite to the face with a circle.
• The face with a triangle is adjacent to both the square and the diamond faces.

Thus, the correct choice is the option in the image above, as it aligns with the configuration of the net when folded into a cube.