Normal wear and road conditions can take their toll on a car’s steering and suspension system, altering __________. A. wheel alignment B. gear ratios C. tire air pressure D. brake operation

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come on man you really don't know this its gear ratios.

The answer is A: wheel alignment  

Bad road conditions and normal wear can take their toll on a car’s steering and suspension system altering the wheel alignment settings and throwing them out of specifications. When your car’s tires start wandering or pulling to one side, make sure to align your tires. A car’s wheels are aligned to achieve maximum tire life, enhance the comfort of your car, and improve fuel economy and handling. Wheel alignment involves adjusting the wheels so that they are parallel to each other. and perpendicular to the ground.