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

In joint tenancy ownership, one of the fundamental requirements is that all co-owners must have equal interests in the property. This means that each owner has an identical share of the property, which distinguishes joint tenancy from other forms of ownership like tenants in common, where shares can differ.

The principle of equal interests ensures that each owner has the same rights over the entirety of the property, and none holds a greater claim than the others. This equality is crucial because it enables the principle of "right of survivorship," which is another key feature of joint tenancy. When one owner passes away, their share automatically transfers to the remaining owners, rather than to heirs or through a will, maintaining the unity of ownership among the remaining tenants.

While other aspects such as shares being acquired simultaneously, inheritability, and consent for sale are associated with joint tenancy, they do not hold the same foundational importance as the requirement for equal interests in ownership. Therefore, the correct answer is rooted in the essential nature of how joint tenancy operates.