Final answer:
A deed is the legal document that conveys an owner's interest in real property, representing the right of ownership and facilitating the transfer of that right from seller to buyer.
Step-by-step explanation:
The item that would convey an owner's interest in real property is a deed. A deed is a legal document that represents the owner's right to a specific property. When a property is sold, it is the deed that is transferred from the seller to the buyer, establishing the buyer's legal ownership. The other options listed, such as a bill of sale, survey, and mortgage do not represent ownership themselves. A bill of sale is a document that records the transaction of personal property, a survey defines the boundaries and dimensions of a property, and a mortgage is a loan agreement secured by the real property.