All the faces of a cube are labeled with I, II, III, IV, V, VI, one on each. The 3 positions of a cube are shown below. The face opposite to the face containing I contains:

The logic followed here is :-

From the given three different cubes the adjacent sides are as shown below :

As I is common on both the dice I and II, it is clear that II, III, IV, and V are adjacent to it, and the remaining i.e., VI will be opposite to it.

Opposite pairs:

II → III

IV → V

I → VI

So, the opposite side of "I" will be side "VI".

Hence, the correct answer is "Option 1".