The following sentence has been split into four segments. Identify the segment that contains a grammatical error.
A Prime Minister of India will address the nation today on the occasion of Independence Day.

Correct option is A

Option (a) contains an error.
The error lies in the use of the indefinite article "A" before a unique designation/title. There is only one Prime Minister of India at a time, making it a specific and unique position, which requires the definite article "The", not "A".
Grammatical rule used:
Use "the" before unique positions or titles when referring to a specific known individual holding that post.
Correct sentence:
"The Prime Minister of India will address the nation today on the occasion of Independence Day."
Example:
❌ A President of the USA addressed the media.
✅ The President of the USA addressed the media.
�� Booster Tip: Always use “the” before singular official positions, celestial bodies, famous monuments, and unique institutions.