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A car that pitches and tosses in normal driving and leans heavily to the side in turns is likely to have trouble in which of the following systems?

  1. Brake.

  2. Ignition.

  3. Steering.

  4. Suspension.

The correct answer is: Suspension.

The correct answer is the suspension system. A car that pitches and tosses while driving and leans heavily to one side during turns is indicative of issues with how the vehicle's suspension is managing weight distribution and body movement. The suspension system's primary function is to absorb shocks from the road, maintain tire contact, and provide stability during both straight-line driving and cornering. When the suspension is compromised, it can lead to excessive body roll and instability, making the vehicle feel unsteady and difficult to control. In contrast, problems related to the brake or ignition systems do not typically cause the vehicle to pitch or lean significantly; those systems affect stopping power and engine performance, respectively. Steering issues generally manifest through difficulty in turning or a lack of responsiveness rather than the side-to-side leaning described. Therefore, troubles in the suspension are the most credible explanation for the driving characteristics outlined in the question.