What type of co-ownership can only be used by married couples?

The correct choice is tenancy by entirety, which is a form of co-ownership specifically designed for married couples. This type of ownership provides certain legal protections and rights that recognize the unity between spouses. Under tenancy by entirety, both partners hold the property as a single entity, meaning that neither spouse can sell or transfer their interest in the property without the consent of the other. This arrangement often protects the property from creditors of one spouse, ensuring that it remains within the family unit.

Other forms of co-ownership, such as tenancy in common and joint tenancy, can involve individuals who are not married, allowing for broader applications. In a tenancy in common, each co-owner has a distinct share of the property that they can freely transfer, and in joint tenancy, co-owners have equal shares and the right of survivorship, but this does not require a marital relationship. Cooperative ownership, which involves shares in a corporation that owns the property, is also unrelated to marital status. Therefore, tenancy by entirety stands out as the exclusive form of co-ownership applicable only to married couples, ensuring unique legal and financial protections for them.