Which of the following is considered a valid form of identification for alcohol purchase in Oregon?

Answer: B — Oregon driver's license

A valid form of identification for alcohol purchase in Oregon must confirm that the individual is of legal age to buy alcohol, which is 21 years or older. An Oregon driver's license is a government-issued ID that includes essential details such as the individual's name, date of birth, and a photograph, all of which are necessary to verify the person's age effectively. The other options provided do not serve this purpose adequately. A birth certificate might prove age but is not a photo ID, making it less useful for on-the-spot verification. Company IDs can vary widely in format and are not universally recognized as valid age verification, while a social security card primarily serves a different official function and does not prove identity or age in a way that meets the requirements for alcohol purchase. Hence, the Oregon driver's license is the only option that fulfills the legal standards for identification in this context.