Choose the box that is similar to the box formed from the given sheet of paper…

When a flat six-square net is folded into a cube, the six faces pair up into exactly three pairs of OPPOSITE faces. Two rules govern this: (1) whenever three squares in the net form a straight, unbroken line, the first and third square always fold to become opposite faces (the middle one becomes adjacent to both); and (2) even a set of three mutually adjacent faces that passes the opposite-face check can still be assembled in two mirror-image ways around their shared corner -- a real cube can be rotated into any view, but never turned into its mirror reflection, so only ONE of those two arrangements is actually reachable from a given net.

1. Label sheet X's six faces in the order they run down the net: a blank face (top), a diagonally hatched face, a face with a circle, a blank face (left of the circle), another blank face, and a small shaded/checkered face -- call them Blank-1, Hatch, Circle, Blank-2, Blank-3, Shaded, in the order they appear along the net.

2. Blank-1, Hatch and Circle form a straight run of three squares in the net, so Blank-1 and Circle fold to become OPPOSITE faces (rule 1).

3. Blank-2, Blank-3 and Shaded also form a straight run of three squares, so Blank-2 and Shaded fold to become OPPOSITE faces (rule 1).

4. That accounts for two of the three opposite pairs; since all six faces must pair up, the only faces left -- Hatch and Blank-3 -- must be the third opposite pair, by elimination.

5. So the three opposite pairs are: {Blank-1, Circle}, {Blank-2, Shaded}, {Hatch, Blank-3}. Equivalently, the circle, shaded and hatched faces are each opposite a different blank face, and are therefore mutually ADJACENT to one another -- no two of them are ever opposite.

6. Check each figure: a figure is IMPOSSIBLE if it shows two faces from the same opposite pair sitting next to each other; it is POSSIBLE only if, in addition, the clockwise/anticlockwise order of its three visible faces around their shared corner matches the order that sheet X's fold actually produces.

Figures 1, 2 and 4 all show the circle, hatched and shaded faces (or two of these plus a blank face) meeting at a corner with no opposite pair adjacent, and in each case the three faces run in the same rotational direction around that corner. Figure 3 shows the identical three faces with no opposite-pair violation either, but its faces run in the reverse (mirror) rotational direction -- the same conclusion is independently confirmed by mentally rolling sheet X's net into a cube face by face and tracking which face ends up on top at each fold, which reproduces the same {Blank-1,Circle}, {Blank-2,Shaded}, {Hatch,Blank-3} pairing and the same single valid rotational sense. Since no rotation of a physical cube can turn one chirality into its mirror image, figure 3 is excluded even though its face selection looks right at a glance.

So the cube can be folded into the arrangements shown in figures 1, 2 and 4, but not figure 3.