In which ownership structure do co-owners hold an equal share and have the right of survivorship?

Joint tenants with the right of survivorship is the correct answer because this ownership structure is characterized by co-owners holding equal shares in the property and having the right of survivorship. This means that if one joint tenant passes away, their interest in the property automatically transfers to the surviving joint tenant(s) without going through probate. This feature is crucial because it ensures that the property remains within the surviving owners rather than being inherited by the deceased tenant's heirs.

In contrast, tenants by the entireties is an ownership structure specifically for married couples, which also includes the right of survivorship but does not apply to co-owners in a broader sense. Tenants in common allows for co-ownership with potentially unequal shares and does not include the right of survivorship; upon the death of one tenant, their share would be distributed according to their will or state law. Ownership in severalty refers to sole ownership by one individual, which eliminates the aspect of co-ownership entirely. Each of these distinctions helps clarify why joint tenants with the right of survivorship is the appropriate choice.