What defines a single right within the bundle of rights in fee simple ownership?

In the context of fee simple ownership, a single right within the bundle of rights refers to a specific legal interest that an owner holds in a property. Fractional interest signifies that an owner has a share or portion of ownership in a property, rather than full ownership. This aligns with the concept of fee simple ownership, which grants the owner a complete set of rights, including the right to sell, lease, use, or develop the property.

The other options do not represent single rights within the bundle:

• Metes and bounds is a method of describing property boundaries and does not define a right within the bundle of rights.
• Leasehold refers to a tenant's interest in a property that is governed by a lease agreement, meaning the tenant does not hold the complete set of rights that come with fee simple ownership.
• Fixtures are items attached to the property, but they do not represent a direct ownership right within the context of discussing fee simple's bundle of rights.

Thus, fractional interest is the option that directly relates to defining a single right within the broader context of ownership in a fee simple estate.