When is it acceptable for individuals under 21 to purchase alcohol?

In North Dakota, as in many other states, individuals under the age of 21 are prohibited from purchasing alcohol at any time. This law is in place to help reduce underage drinking and its associated negative consequences, as it is widely recognized that alcohol consumption at a young age can lead to various health issues and impaired judgment.

The other options imply scenarios where young individuals may believe they can legally purchase alcohol, but none of them align with the legal framework governing alcohol sales to minors. Parental permission, holiday allowances, or attendance at registered events do not grant any exceptions to the legal age requirement for alcohol purchases. Therefore, option B is the accurate answer because it reflects the law's strict stance on underage alcohol consumption.