Which of the following is a natural source of light?

• A. Light bulbs
• B. Fluorescent lights
• C. Sun, stars, lightning, fire
• D. Street lamps

Answer: (C)

The correct answer is the sun, stars, lightning, and fire because these sources of light occur naturally in the environment. The sun is the primary source of light for Earth, providing illumination during the day and energy for various ecological processes. Stars also produce light through nuclear fusion, while lightning generates a brief flash of light due to electrical discharges in the atmosphere. Fire, such as from a campfire or a wildfire, produces light through combustion.

In contrast, the other options listed—light bulbs, fluorescent lights, and street lamps—are man-made sources of light. These artificial light fixtures rely on electricity and other human inventions to produce illumination. Understanding the distinction between natural and artificial light sources is important in recognizing how we interact with and utilize light in our daily lives.