Question

emission of light from an atom occurs when an electron

jumps from a lower to a higher energy level
drops from a higher to a lower energy level
falls into the nucleus
moves within its atomic orbital

Explanation:

When an electron drops from a higher - energy level to a lower - energy level, it emits energy in the form of light. When an electron jumps from a lower to a higher energy level, it absorbs energy. Electrons do not fall into the nucleus in normal atomic behavior, and moving within its atomic orbital (without a change in energy level) does not result in light emission.

Answer:

drops from a higher to a lower energy level