Which of the following sources in not currently used to produce electricity for us in our homes?

A) coal

B) oil

C) nuclear

D) lunar

The correct answer would be D - lunar.

Option D is the only source of energy that in not currently used to produce electricity in our homes. Researchers are creating lunar panels (similar to solar panels) but there are obstacles to large-scale energy production.

The moon can generate electricity, but for now it's just not accessible.