请选择ABC4M2O5y/{-f7h;e.J5m:q一Is everyone here? - _______.3~4w9},A8X*I0L
A. Yes，I am.3~4w9},A8X*I0L
B. No. you aren't.3~4w9},A8X*I0L
C. Yes，we are all here.3~4w9},A8X*I0L