Drunk driving, which was once a frequent occurrence, is now______.

A．under debate

B．under control

C．under construction

D．under investigation

根据国内分行外汇资金业务的经营规模、盈利能力和管理水平，制订分行代客外汇买卖业务（含个人实盘业务）的敞口权限，所有货币对总敞口头寸不超过等值（）万美元。

A、20

B、30

C、50

D、100