Which of the following marriages is automatically valid?

A marriage is considered automatically valid when it meets all the requisite legal conditions outlined by state laws. These requirements typically include mutual consent of both parties, the ability to marry (which encompasses factors such as age and mental capacity), and observance of any necessary formalities, like a ceremony or the presence of a licensed officiant.

When all these requirements are satisfied, the marriage is recognized as valid, meaning it is legally binding and offers the rights and obligations associated with marriage. This encompasses issues such as property rights, spousal support, and inheritance, which would not be available in a marriage deemed invalid.

The other choices present scenarios that reflect complications or potential invalidity in marriages. For instance, marriages lacking parental consent for parties under age 18 often have specific legal stipulations, and may require judicial consent to be considered valid. Marriages between first cousins may be subject to various state laws regarding consanguinity and thus may not automatically be valid everywhere. Additionally, while a marriage solemnized by a notary public might be valid in certain jurisdictions, it may not fulfill all necessary legal formalities in others.

Therefore, only a marriage that adheres to the full framework of legal requirements can be classified as automatically valid, confirming the correctness of the chosen answer