The correct answer is option 1, the Sun. The Sun produces light through a chemical process called nuclear fusion. Nuclear fusion occurs in the Sun`s core, where hydrogen atoms combine to form helium. This process releases a tremendous amount of energy in the form of light and heat. The Sun is able to sustain this process due to its incredibly high temperatures and pressure.

Option 2, the Moon, does not produce its own light. The Moon reflects the light of the Sun, making it appear bright in the night sky. Similarly, option 3, an electric bulb, produces light through the flow of electricity. This is achieved by passing an electric current through a filament or gas, which emits light energy.

Option 4, lightning and thunder, do not produce light through a chemical change. Lightning is an electrical discharge caused by the buildup and discharge of electrical energy between clouds or between a cloud and the ground. Thunder is the sound produced by the rapid expansion and contraction of air surrounding a lightning bolt.

Therefore, the Sun is the only option that produces light through a chemical change, specifically nuclear fusion.