设集合U={(x,y)｜x∈R,y∈R},A={(x,y)｜2x-y+m>0},B={(x,y)｜x+y-n≤0}，那么点P(2，3)∈A∩(C_UB)的充要条件是
A.m>-1且n<5                        B.m<-1且n<5
C.m>-1且n>5                        D.m<-1且n>5