To answer this question, let's consider the properties of a standard dice cube.
A standard dice cube has six faces, numbered from 1 to 6. The opposite faces of a dice cube are always arranged in a specific way: 1 is opposite 6, 2 is opposite 5, and 3 is opposite 4.
If we add up the numbers on opposite faces, we get:
1 + 6 = 7
2 + 5 = 7
3 + 4 = 7
Therefore, the opposite sides of a dice cube do not always add up to eight. Hence, the correct answer is B) False.