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 .
Why has the Raiders defensive line not been firing on all cylinders ?
Pick the best answer from the following options:
- They have been relocated to a new stadium .
 - They have an injured player .
 - They are quitting on the field .
 - They ca n't afford good players .


They have an injured player .