河南某铜矿山(独立开采铜矿)2009年10月份开采提炼精矿3000吨，并全部销售，选矿比为20%，该矿山铜矿属于3等，按规定单位税额为每吨20元，该矿山当月份应纳资源税是( )。

A．60000元

B．84000元

C．180000元

D．300000元

I am wondering ______________.

A．why did he come to school late

B．why he came to school late

C．that he came to school late

D．why was he late for school