Final answer:
To back with a trailer correctly, one should back up in as straight a line as possible and correct any drift by steering in the opposite direction of the drift. The correct answer is Option (C).
Step-by-step explanation:
When backing with a trailer, the correct technique is to back in as straight a line as possible (Option C). This method allows for greater control and simplifies the process of maneuvering the trailer. If the trailer begins to drift, you should correct the drift.
This requires turning the steering wheel in the opposite direction of the drift, which may seem counterintuitive at first. For example, if the trailer drifts to the left, you would turn the steering wheel to the right to align it back on course.
It is essential to make small adjustments and corrections as needed, and it is acceptable to pull forward to reposition if necessary.