Which of the following is a requirement for establishing a joint tenancy?

Establishing a joint tenancy requires certain key elements, one of which is that all parties must acquire their interest at the same time. This principle, known as the "time" requirement, is one of the four unities essential to creating a joint tenancy. Along with time, the other unities are title, interest, and possession. All joint tenants must have equal rights to the property and must take title to the property simultaneously.

The choice indicating that ownership must be divided equally among tenants addresses the unity of interest but does not alone satisfy the core requirement of acquiring the interest at the same time. Similarly, stating that property must be residential or that there must be a written agreement does not align with the foundational legal principles defining joint tenancy. Joint tenancies can exist in a wide range of property types, and while a written agreement may clarify ownership, it is not legally necessary to establish a joint tenancy. Thus, the requirement that all parties must have acquired their interest at the same time stands as a critical aspect of creating a joint tenancy.