The last two years , Derrick Burgess has been the Raiders ' most productive defensive lineman . But with a lingering calf injury that began nearly a month ago , the Pro Bowl end is lucky just to get on the practice field . He 's not the only Oakland defensive lineman hurting , either .

Question: Why has the Raiders defensive line not been firing on all cylinders ?
Answer: They have been relocated to a new stadium .They are quitting on the field .They ca n't afford good players .They have a star injured .