What is the definition of liability?

Answer: B — When you are at fault in a crash

Liability, as defined in the context of driving and road safety, refers to being at fault in a crash or responsible for causing an accident. This means that if you are deemed liable in a crash, it is determined that you are the one who is responsible for the accident occurring. Therefore, the correct answer is option B. Options A, C, and D are incorrect: A. The ability to see things clearly near and far away pertains to visual acuity, not liability. C. The description provided refers to a runaway truck ramp, not liability. D. A group of law-breaking vehicles is not the definition of liability.