A major benefit of a power steering system is that it reduces driver effort by using hydraulic or electric assist.
This makes steering smoother and easier, especially at low speeds or when parking.
Additionally, power steering reduces the total number of steering wheel turns required to move the wheels from one extreme position to the other.
This full range is called lock to lock — meaning from full left lock to full right lock.
By reducing lock to lock turns, the driver can steer quickly and comfortably with minimal effort.
Options like left to right or right to left describe direction but not the entire steering range.
Therefore, the correct answer is lock to lock.