What is the consequence of possessing, purchasing, or consuming an open container of alcohol for persons aged 18 to 20?

Possessing, purchasing, or consuming an open container of alcohol for individuals aged 18 to 20 is indeed a violation of Iowa law. Iowa has established laws that prohibit those under the legal drinking age of 21 from engaging in any activity involving open containers of alcohol. This law aims to curb underage drinking and its associated risks, ensuring that young individuals do not gain access to alcohol until they reach the legal age.

The other options do not accurately reflect the legal framework in Iowa. Parental consent does not grant an exception to this law. Consuming alcohol on private property is also restricted for individuals under 21, and the legality does not vary based on the location if the individual is underage. Furthermore, the legality of open container possession or consumption is not contingent on whether a person is driving; the law clearly prohibits such actions regardless of the situation.