What is a celestial object?
A) Naturally occurring physical entity which exists in the observable universe.
B) Artificially occurring physical entity which exists in the observable universe.
C) Naturally occurring physical entity which exists in the observable solar system.
D) None of these.

Hint: For the above problem we will define what are celestial objects?
Any entity which is naturally occurring (physically), may be a collection, association or have some attainable form that exists in the universe and is observable to us.
We will also cite an example of celestial objects.
Such as the moon, sun, meteorites etc.

Complete answer:
In astronomy, a celestial object is a naturally occurring physical entity, association or structure that exists in the observable universe. Thus a celestial object is a complex, less cohesively bound structure, which may consist of multiple bodies or even other objects with substructures, such as galaxy ,which is a hierarchical structure, structure within structure.
Celestial objects include comets, asteroids, meteors, supernovae, star clusters, the moon, planets, galaxies, planetary systems.
Among all a comet may be identified as both object and body. It is a body when referring to the frozen nucleus of ice and dust, and an object when describing the entire comet with its diffuse coma and tail.
We have found out that celestial objects are the physical entities which are observable in niverse.

Hence, Option A is correct.

Note: One of the best examples of celestial objects is the occurrence of the phenomenon of lunar and solar eclipse. Lunar eclipse occurs when shadow of falls on moon, in other words earth comes in between the moon and the sun .Solar eclipse occurs when shadow of moon falls on the earth, when moon comes in between the sun and the earth.solar and lunar eclipse should not be watched with naked eyes, one must wear protective glasses or must see shadow of the occurrence of the eclipse in water.