English to German Tech/Engineering Automotive / Cars & Trucks motor störungen

On a truck with a long-and-short arm front suspension and a leaf spring rear suspension, the steering pulls to the right while driving straight ahead. All of the following defects could be the cause of the problem EXCEPT:
a. a broken center bolt in the left rear spring
b. a more positive caster on the left front wheel than the right front wheel
c. low tire pressure on the right side
d. excessive toe-in on the front wheels