Question

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?

Answer 1

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.

Answer 2

A. His spouse.

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.