If  the given sheet is folded to form a cube, which of the following figures are possible?

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From 6 1 5:

6 and 5 are opposite faces.

From 1 5 3:

1 and 3 are opposite faces.

Therefore,

2 and 4 are opposite faces.

Now,

Figure A is not possible because 1 and 3 should be opposite faces.

Figure B is not possible because 6 and 5 should be opposite faces.

Figure C is possible because 5 3, 5 2 and 3 2 can be side faces.

Figure D is possible because 6 1, 4 6 and 4 1 can be side faces.

Thus, Option B is correct.