If a person puts all his property into joint ownership, upon his death becomes the sole owner of the property.

His spouse?

His lawyer?

The state?

A. His spouse.

Step-by-step explanation:

We are asked to find the owner of a joint property at the death on one person, when a person puts all his property into joint ownership.

We know that by the right of survivorship, the surviving owner automatically gets the share of the property of a dead owner.

We know that mostly a person gets a joint account with his spouse, therefore, the spouse will be the sole owner of the property after his death.

Property with right of survivorship automatically passes to the survivor when one of the original owners dies.

This being said your answers refer to relationships between a person and their Spouse, Lawyer, or State. In my opinion the person with whom another person would most likely place their property in joint tenancy with would be in a marital relationship, so my answer is his Spouse.