I ask you some question~    

Michael: Did you put it in your schoolbag?

Patrick:Of course I did.                                .

Michael:That's mine. Mine is different from yours.There's my name on it.

A. Do you mind lending me your pencil?

B. My mother put the pencil case in my schoolbag.

C. Who canhelp me get back my pencil case?

D. Look! Whose pencil case is that?

Answer:D