The luminous celestial bodies visible during a clear night are usually known as

Answer: (c) stars

The luminous bodies seen on a clear night are mostly stars.

The idea

A star produces its own light, while planets and ordinary satellites are seen mainly by reflected sunlight. Most point-like lights seen on a clear dark night are distant stars. A brief moving streak belongs to a different kind of event.

Why the others are wrong

(a) Planets shine by reflected light and are few.

(b) Meteors are brief streaks.

Also know

The Sun is the nearest star, and the Milky Way is our galaxy. Stars often appear to twinkle because their light is disturbed by moving air; planets usually twinkle less because their apparent discs average out some of that disturbance. Brightness alone cannot reliably distinguish a planet from a star.