Identify the segment in the sentence which contains the grammatical error.
A Earth moves round the Sun.

Correct option is C

Option (c) contains an error.
Explanation:
· The word “Earth” is a proper noun and refers to a unique object, so it should always be preceded by “the”, not “a”.
· Correct usage: the Earth
Grammatical Rule Used:
Articles before unique things like the Earth, the Moon, the Sun → always “the”
Never use “a” before proper nouns.
Example:
· The Earth is round.