Choose the grammatically correct sentence:

The correct answer is Option (3) → Dhruv has not decided whether he will take science or commerce in Class 11.

“Whether ... or”:

• “Whether” shows a choice between two things. Its partner word is “or”.
• Here whether he will take science or commerce gives Dhruv’s two choices.

Why the Other Options are Incorrect?

Option 1: Dhruv has not decided whether he will take science nor commerce in Class 11. — Incorrect. The option says “whether ... nor”. “Nor” goes with “neither”, not with “whether”.

Option 2: Dhruv has not decided whether he will take science either commerce in Class 11. — Incorrect. The option says “science either commerce”. “Either” cannot join the two choices. After “whether”, they are joined by “or”.

Option 4: Dhruv has not decided whether he will take science but commerce in Class 11. — Incorrect. The option says “science but commerce”. “But” shows a contrast, not a choice. After “whether”, the two choices are joined by “or”.