Question

electrons emit light when they transition from one element to another a lower energy level to a higher one a higher energy level to a lower one the first energy level to the last one

Explanation:

Electrons emit light when they move from a higher - energy state to a lower - energy state. This is because the excess energy is released in the form of photons (light). Moving from one element to another is not the cause of light emission in this context. Moving from a lower to a higher energy level requires energy absorption, not emission. And the transition from the first to the last energy level is not the general principle for light - emitting transitions; it's the high - to - low transition that matters for emission.

Answer:

C. a higher energy level to a lower one