确定浅昏迷最有价值的体征是 （）

A.对疼痛刺激无反应

B.眼球有浮动

C.Babinski征阳性

D.咳嗽反射消失

E.腱反射消失

—I don't know ____ makes her different from others．

—Confidence, I think.[ ]

A．how is it that    

B．how it is that    

C．what is it that    

D．what it is that