The Probability of Being in an Accident Increases as a Driver's

Multiple Choice

The probability of being in an accident increases as a driver's blood-alcohol content (BAC) rises. It has been observed that the probability rises faster and faster as the BAC increases. Let $P(x)$ be the probability that a driver will be involved in an accident as a function of $x$ , the driver's BAC. Let $L$ be the BAC at or above which it is illegal to drive. Let $b=P(0)$ . What is the meaning of $P^{-1}(5 b)$ ?

A) The probability of an accident for someone who has had 5 drinks.
B) 5 times the probability of an accident for someone who hasn't been drinking.
C) The BAC at which the probability of an accident is 5 times that of a person who hasn't been drinking.
D) The BAC at which the probability of an accident is 5 times that of a person whose $\mathrm{BAC}$ is at the legal level.