A is the correct answer as Qian-long refused to trade with Britain when king George sent his delegation led by George Macartney to China. Emperor was determined that he won't established trade links with Britain.
B is not correct as Kangxi who preceded Qian-long never had this type of dispute with Britain.
C and D are not correct answers as it doesn't refer to any Chinese ruler from that dynasty. Moreover it probably refers to Mughal and Ottoman leaders from that period.
