Q: Fact 1: Alight bulb requires electrical energy to produce light. Fact 2: Coal today is mostly used for power plants creating electricity. Given the two facts above, what can power a light bulb?

Possible answers: [i] copper; [ii] coal; [iii] Cars; [iv] Gas; [v] motors; [vi] heat; [vii] energy; [viii] metal;
The answer is:
[ii]