खालीलपैकी कोणता पर्याय गटातील इतर पर्यायांशी जुळत नाही? A. twitter.com B. facebook.com C. whatsapp D. youtube.com

twitter.com, facebook.com and youtube.com are website addresses (domain names). WhatsApp is written as an app name, not a web domain, so it is the odd one.