请选择ABC:{3e-]0@4b8x(^:g5U*Q7[6P -Who are your parents talking ____________?;u1{,R4P4Y(P0f4~7v
-I don't know.;u1{,R4P4Y(P0f4~7v
A. for;u1{,R4P4Y(P0f4~7v
B. to;u1{,R4P4Y(P0f4~7v
C. on;u1{,R4P4Y(P0f4~7v