question: WeChat:WhatsApp:Snapchat
choices.label: A B C D
choices.text: scanner:printer:cartridge google:Yahoo:Naver stamp:mail:mailbox computer:mouse:display
explanation: "WeChat", "WhatsApp" and "Snapchat" are all mobile apps. the "cartridge" is part of the "printer". "google", "Yahoo" and "Naver" are all well-known internet sites. a "stamp" is a postage certificate for posting a "mail" . "mailbox" can be used to post "mail". mailboxes cannot post stamps. "mouse" and "display" are part of a "computer", "mouse" is not part of "display".
relation: WeChat WhatsApp Snapchat R2.4
relation: printer cartridge R2.3
relation: google Yahoo Naver R2.4
relation: stamp mail R3.10
relation: mail R3.10
relation: computer mouse display R2.3