The right word to fill in the gap of the following sentence— ‘Give her a telephone number to ring — she gets lost’-

✅ কেন সঠিক: ‘In case’ introduces a precaution against something that might happen: Give her a telephone number to ring in case she gets lost. (The option is printed ‘Incase’; the correct form is two words, ‘in case’.)

❌ অন্য অপশন: ‘Whether’ introduces alternatives (whether … or); ‘unless’ means ‘if not’, which gives a wrong meaning; ‘perhaps’ is an adverb and cannot join two clauses.

💡 মনে রাখুন: in case = যদি (প্রয়োজনে/সাবধানতার জন্য): Take an umbrella in case it rains.