Which of the following is considered acceptable evidence of ownership?

A title insurance policy is recognized as acceptable evidence of ownership because it provides a guarantee from an insurance company that the title to the property is free from defects and encumbrances, except those explicitly stated in the policy. This policy protects the buyer from future claims against the property, ensuring that the title is valid and that the buyer has the legal right to claim ownership. It serves as proof that the title has been reviewed for any potential issues, making it a strong form of evidence in real estate transactions.

In contrast, other options such as a quitclaim deed might transfer whatever interest the grantor has in the property but does not guarantee that the title is clear or valid. A warranty deed provides some assurance regarding the title, but the level of protection is primarily about the seller's obligations rather than serving as formal proof of ownership. An informal agreement lacks the legal formalities required to establish ownership and generally wouldn't hold up in a legal context. Therefore, while all these documents play roles in real estate transactions, a title insurance policy is the most reliable evidence of ownership.