Which of the following are natural light sources: A) Stars B) Moon C) Sun D) Earth? (1) A and B only (2) A and C only (3) B and C only (4) C and D only

What the question is really asking

A light source is something that emits its own light. The key is to separate objects that produce light from objects that only reflect light.

Checking each option (A to D)

• A: Stars: Yes, stars emit their own light due to nuclear fusion.
• B: Moon: No, the Moon is visible because it reflects sunlight.
• C: Sun: Yes, the Sun emits its own light (it is a star).
• D: Earth: No, Earth is seen because it reflects sunlight (and artificial lights), not because it naturally emits light.

Matching to the answer choices

Only A (Stars) and C (Sun) are natural light sources, so the correct option is (2) A and C only.

Quick self-check

If the Sun were turned off, stars would still shine, but the Moon and Earth would be dark (except for artificial lights).