静脉注射美洲箭毒3～4分钟即可产生肌肉松弛作用，其作用机制是

A．它增加接头前膜对Mg²⁺的通透性

B．抑制Ca²⁺进入接头前膜

C．它与乙酰胆碱竞争终板膜上的受体

D．抑制囊泡移向接头前膜

E．抑制终板膜的离子通道开放

You don't have to show（）to me. You can have your own ideas.

A.attachment

B.aggression

C.submarine

D.submission