What is the role of a designated driver?

Answer: B — person who abstains from alcohol to ensure safety

The role of a designated driver is to abstain from alcohol in order to ensure the safety of themselves and their passengers. This person takes on the responsibility of driving others who may be consuming alcohol, thereby significantly reducing the risk of impaired driving incidents. By remaining sober, the designated driver can navigate the roads safely, making sure that everyone in the group gets home without needing to worry about the dangers associated with driving under the influence. This concept promotes responsible behavior and emphasizes the importance of having a reliable plan when alcohol is involved, ultimately contributing to safer roads and communities. The other options represent behaviors that are contrary to the concept of a designated driver, which emphasizes safety and responsibility.