Correct option is B
· ✔️ The correct option to fill in the blank is (b)
couldn't.
· The sentence refers to a past inability to attend the party, hence the use of the past modal "couldn't" is correct.
Grammatical Rule Used:
· ✔️ Use of Past Modals – “Couldn’t” is the past form of “can’t” used to express inability in the past.
Explanation of the Grammatical Rule in Hindi:
· ✔️ जब हम अतीत में किसी कार्य को न कर पाने की स्थिति दर्शाते हैं, तो "couldn't" का प्रयोग करते हैं।
· उदाहरण: "He couldn’t finish the work on time."
Meanings of the Other Options:
· ❌ (a)
Can’t – Indicates present or general inability.
· ❌ (c)
Hasn’t – Present perfect negative form, grammatically incorrect here.
· ❌ (d)
Had – Simple past, not suitable in this structure.