Final answer:
The defect in the braking system can interfere with a vehicle's ability to slow down or stop. Option C is correct.
Step-by-step explanation:
A defect in the braking system poses a significant safety risk by impeding the vehicle's ability to slow down or come to a complete stop when needed. Brakes are crucial for controlling speed and ensuring safety on the road. If compromised, they affect the vehicle's ability to respond to traffic conditions or emergencies promptly. Steering functionality remains independent of the braking system, so option A is incorrect.
Similarly, acceleration and gear shifting are primarily managed by the engine and transmission systems, respectively, and aren't directly impacted by brake malfunctions. However, a faulty braking system can compromise the vehicle's ability to decelerate, affecting the driver's control over the speed. Hence, option C, the inability to slow down or stop, is the most critical consequence of a defect in the braking system.
Correct Answer: C. slow down or stop