Select the dices that can be formed by folding the given sheet along the lines.

Only 2 and 3

Every alternate positions in an open dice are opposite to each other.

@  ↔  !  are opposite to each other

6  ↔  2  are opposite to each other

4  ↔  1  are opposite to each other

It is clear,

In figure (1), 1 and 4 are at adjacent positions, therefore dice cannot be formed.

Similarly,

In figure (4), 2 and 6 are at adjacent positions, therefore dice cannot be formed.

Therefore, option (4) is correct.