Select the most appropriate option to fill in the blank.
________ I cannot understand is how you could walk so far.

Correct option is A

✔️ The correct option to fill in the blank is (a) What.
· Explanation:
· “What I cannot understand” is a noun clause acting as the subject of the sentence.
· “What” introduces a clause that refers to a specific unknown fact, which is further clarified later in the sentence.
· Grammatical rule used:
· “What” is used as a relative pronoun to form noun clauses, particularly to refer to an unknown idea or subject.
· Hindi Explanation: “What” का प्रयोग उन बातों के लिए होता है जिन्हें हम नहीं समझ पा रहे हों। यह noun clause बनाता है जो वाक्य का subject होता है।
· Meanings of other options:
· (b) Which:
· Meaning: Refers to a choice between a known, limited set.
· Hindi meaning: कौन-सा / कौन-सी
· Example: Which book do you prefer?
· ❌ Incorrect here, as no specific set is referenced.
· (c) When:
· Meaning: Refers to time.
· Hindi meaning: कब
· Example: When are you coming?
· ❌ Doesn’t fit the structure of the noun clause here.
· (d) How:
· Meaning: Refers to method or manner.
· Hindi meaning: कैसे
· Example: How did you make this?
· ❌ Although “how” is used later in the sentence, the subject of the sentence must be “what.”