When backing under a trailer, you should line up the tractor:

Directly in front of the trailer.. Section 6.4: Line up straight.

When backing under a trailer, you should line up the tractor:

ANSWER BREAKDOWN
  • A. Correct. Line up straight.
  • B. Incorrect. "At a 45 degree angle." is not correct. Line up straight.
  • C. Incorrect. "From the side." is not correct. Line up straight.
  • D. Incorrect. "Anywhere." is not correct. Line up straight.