请选择CBA7x-|'m.W.C+r;k+o一Is everyone here? － _______.(U+@;z7l:a,d8s5o
A. Yes，I am.(U+@;z7l:a,d8s5o
B. No. you aren't.(U+@;z7l:a,d8s5o
C. Yes，we are all here.(U+@;z7l:a,d8s5o