Q: Fact 1: Asolar panel converts sunlight into electricity. Fact 2: Lasers are powered by electricity. Given the two facts above, what can power lasers?

Available choices:
(a). photons;
(b). rays or beams;
(c). rocks;
(d). heat energy;
(e). solar panels;
(f). nothing;
(g). energy;
(h). air;
A:
(e).