Which of the following behaviors falls under underage violations?

Underage possession or use of alcohol distinctly falls under the category of underage violations because it specifically addresses activities that are legally prohibited for individuals under a certain age, typically 21 in the United States. Laws are established to restrict the consumption and possession of alcohol to prevent the potential negative consequences associated with drinking at a young age, such as impaired judgment, health risks, and increased likelihood of dangerous behavior. This violation reflects the legal framework designed to protect minors and encourages responsible behavior regarding alcohol use.

The other behaviors listed, while illegal, do not specifically pertain to age-related restrictions. For example, driving without a license is a violation of driving regulations for all individuals, regardless of their age. Similarly, shoplifting and assault are crimes that apply to all ages and focus on theft and violence issues rather than the restrictions placed on minors regarding alcohol consumption.