单项选择题

According to the news, which of the following country could be affected by the toxic mud
What did BP do in order to clear away the oil in the Gulf of Mexico

A.BP used robotic vehicles to cut a damaged pipe at the well.
B.Crews turned to placing a cap over the pipe.
C.Workers are drilling two relief wells in an effort to ease pressure on the damaged well.
D.All of the above are right.