Final answer:
The correct answer is D, rotors. Improperly torqued lug nuts can lead to warping of the rotors, causing a pulsing feeling in the brake pedal during use.
Step-by-step explanation:
The correct answer is option D, rotors. When lug nuts are not torqued properly after installing wheels, it can cause uneven pressure on the brake rotor. This uneven pressure can lead to warping of the rotors. Warped rotors can cause the vehicle to experience vibrations or a pulsing feeling in the brake pedal when the brakes are applied. It is crucial that lug nuts are tightened to the manufacturer's specified torque using a calibrated torque wrench to prevent this issue.
To answer your question directly, brake calipers and pads are less likely to be warped due to improper lug nut torque. However, they could eventually be affected by the warped rotors during braking. Brake drums, used in some vehicles, are typically not directly affected by wheel installation, as they are not exposed to uneven lug nut torque in the same way rotors are.