DO YOU KNOW THE LADY ……….. SON IS STANDING OVER THERE

400. - 400 CAU TRAC NGHIEM GIUP ON TAP TIENG ANH LOP 9
400 CAU TRAC NGHIEM GIUP ON TAP TIENG ANH LOP 9
400. Do you know the lady ……….. son is standing over there?A. who B. whom C. which D. whose