In Montana, the concept of "tenancy by the entireties" is not recognized. This form of property ownership typically applies only to married couples and allows them to own property jointly, with rights of survivorship. Since Montana does not allow this type of ownership, a deed that states the owners are tenants by the entireties would be invalid.
The other options present scenarios that are valid under Montana law. A deed with multiple owners listed can signify different forms of co-ownership, such as joint tenancy or tenancy in common, both of which are acceptable. Furthermore, a deed that includes a lien is valid, as liens can be attached to property for various financial obligations. Lastly, a deed that fails to mention property restrictions does not invalidate the deed itself; it merely means that there are no stated restrictions, which is not unusual. Therefore, the issue with option A is that it proposes a form of ownership that does not exist in the state.