单项选择题

The two-step cutback mentioned by some of the ministers is to ______.

A.stop producing more petroleum and cut off the petroleum by one million barrels per day
B.produce no more than the quota and make their quota 23.5 million barrels per day
C.stop producing 24.5 million barrels per day and then lower the output quota by one million barrels per day
D.lower the output by one million barrels per day and produce exactly the quota