Fact 1: Electricity is used as an energy source by electrical devices. Fact 2: Sunlight can be converted to electricity. Given the two facts above, what can be used as an energy source by devices?

Choices:
(1). friction
(2). sunlight
(3). heat
(4). sun's heat
(5). Light
(6). cells
(7). wind
(8). oxygen
Answer:
(2).