Fact 1: Agenerator converts kinetic energy into electrical energy. Fact 2: Electrical energy is converted into light energy in the headlights. Given the two facts above, a generator converts kinetic energy into something, which can then be converted to light by what?

Pick from: 1). focusing a lens 2). sensory neurons 3). headlights 4). heating liquids 5). sunlight 6). Evaporation 7). cycles 8). engines
The answer is:
3).