Concept:Opposite faces of a cube never touch each other, so they can safely share the same colour.
Explanation:A cube has
6 faces arranged in
3 opposite pairs.
Colour each opposite pair with one colour: top-bottom, front-back, left-right.
Using
3 colours, no two adjacent faces have the same colour.
With only
2 colours, some adjacent faces would be forced to share a colour.
Therefore, the minimum number of colours required is
3.
Answer:Three colours are required. Correct option: A. Three.