On a Power Steering Rack System, a Customer Complains That

On a power steering rack system, a customer complains that the steering wheel is not level. The concern is verified during a road test. It is also noticed that the wheel is sometimes off to the right, and sometimes off to the left. The most likely cause of this condition is:

A) Incorrect preload on rack guide
B) Incorrect tire pressure
C) Wheel alignment being out of specifications
D) Worn mounting bushings for the power steering rack housing