I turn off the TV. I wanted my younger sister to study in peace and quiet.
A.I turn off the TV in order to my younger sister can study in peace and quiet.
B.I turn off the TV in order that my younger sister can study in peace and quiet.
C.I turn off the TV so that my younger sister to study in peace and quiet.
D.I turn off the TV to my younger sister can study in peace and quiet.