In following question, there may be an error in one part of the sentence. That error part would be your answer. If there would be no error in the sentence, your answer would be ‘No error’.
Here are three qualities (A) of paper. What quality (B) do you prefer (C) No error.

Correct option is B

Option (b) contains an error.
Explanation: When a choice is limited (as in “three qualities”), we use the interrogative pronoun “which” instead of “what.”
Correct sentence: Here are three qualities of paper. Which quality do you prefer?
Grammatical rule used:
Use “which” for specific or limited options. Use “what” for general, open-ended questions where options are unknown.
Rule in Hindi:
जब विकल्प सीमित हों, जैसे "तीन qualities", तब “which” का प्रयोग किया जाता है। “What” का प्रयोग तब होता है जब विकल्प अनिश्चित हों।
Example:
· Which subject do you like best among Maths, Science, and English?
· What do you want for dinner? (Unlimited choices)