After the new technique was applied to production, the factory has produced ______ over the same period last year.

A．many cars twice as

B．twice as many as cars

C．twice cars as many as

D．twice as many cars as

甲公司2011年3月A生产车间共发生管理人员工资、折旧费、水电费等费用90000元，假定该车问本月仅生产了A和B两种产品，生产A产品发生的直接生产人员工时为4000小时，B产品为2000小时，甲公司采用生产工人工时比例法对制造费用进行分配，则A产品应分配的制造费用为( )元。