In a certain code language, 'po ki top ma' means 'Usha is playing cards'; 'kop ja ki ma' means 'Asha is playing tennis'; 'ki top sop ho' means 'they are playing foot-ball' and 'po sur kop' means 'cards and tennis'. Which word in that language means 'Asha'?

• A. ja
• B. ma
• C. kop
• D. top