I don’t think it easy, even if we work hard, ______ the South Korea and the North Korea to sit down to talk at present.

A．persuaded

B．to persuade

C．persuade

D．persuading

某甲是精神病患者，一日他突然手持匕首追杀某乙，甲将乙逼到一房屋的角落里，乙在无处可逃的情况下，顺手将桌上的花瓶拾起扔向甲，致使甲右眼失明，乙的行为是：

A．正当防卫

B．防卫过当

C．犯罪行为

D．紧急避险