Answer:
The correct option is 1. Two letters D and B appear on opposite faces.
Explanation:
The given figure is a net of a cube.
If we folds the this net into a cube, then the alternative consecutive faces are opposite.
From the given figure it is clear that the A and C, B and D are alternative consecutive faces. It means A and C are opposite faces, B and D are opposite faces.
Since a cube has six sides, which contains three pairs of opposite faces, therefore E and F are opposite faces.
Two letters D and B appear on opposite faces. Therefore the correct option is 1.