The correct translation of 'স্মার্টফোন এক সময় জনপ্রিয়তা হারাবে'।

• ক Smartphones will lose their popularity once upon a time.
• খ Smartphones will lose their popularity someday. ✅ সঠিক উত্তর
• গ Once upon a time smartphones will lose their popularity.
• ঘ Smartphones will lose their popularity sometime.