this与that的用法区别 — 英语选择题

美术课后，你手里拿着一块离你很近的橡皮（rubber），窗台上放着一把离你很远的尺子（ruler）。你想问它们是不是Liu Tao的，下面哪组问法完全正确？A. Is this your rubber? Is that your ruler? B. Is that your rubber? Is this your ruler? C. Is this your ruler? Is that your rubber? D. Is this your rubber? Is this your ruler?