下列关于卡环固位臂与固位力的关系的说法，错误的是（）。

A.卡环臂越长，固位力越好

B.卡环臂越粗，固位力越大

C.铸造卡环横向固位力好

D.锻丝卡环纵向固位力好

E.刚度相同的材料，弹性限度大者固位好

There are many passengers hit by cars and killed ________ because of the drivers' overdrinking,

so drivers' drinking is strictly limited now.[ ]

A. on the spot  

B. in the spot

C. under the spot  

D. on a spot