Final answer:
The risk of causing a motor vehicle accident becomes 25 times greater when the Blood Alcohol Concentration (BAC) level reaches 0.08% or higher.
Step-by-step explanation:
The risk of causing a motor vehicle accident becomes 25 times greater when the Blood Alcohol Concentration (BAC) level reaches 0.08% or higher. This is the legal threshold for intoxication in most US states. At this level, a person's cognitive and motor skills are significantly impaired, making them more likely to make errors while driving and increasing the risk of accidents.