The 'space cushion' is:

The space all around your vehicle.. Section 2.7: You need space all around your vehicle. This space cushion gives you room to stop or turn

The 'space cushion' is:

ANSWER BREAKDOWN
  • A. Incorrect. "The seat in the cab." is not correct. You need space all around your vehicle. This space cushion gives you room to stop or turn if you need to.
  • B. Incorrect. "The space between your truck and the curb." is not correct. You need space all around your vehicle. This space cushion gives you room to stop or turn if you need to.
  • C. Correct. You need space all around your vehicle. This space cushion gives you room to stop or turn if you need to.
  • D. Incorrect. "The cargo area." is not correct. You need space all around your vehicle. This space cushion gives you room to stop or turn if you need to.