Final answer:
A proprietary tenant is likely to own interest in a cooperative, where the individual owns shares in the corporation owning the property instead of owning the unit outright.
Step-by-step explanation:
If a man is considered a "proprietary tenant," he most likely owns interest in a cooperative (coop). In the context of real estate, particularly in urban areas, "proprietary tenant" is a term used to describe a person who owns shares in a housing cooperative. In a cooperative, rather than owning the unit outright like a single-family home or condominium, the individual owns shares in the corporation that owns the property and receives a proprietary lease as a right to occupy a specific unit. This is distinct from a condominium, where the individual would own the actual unit and have a deed to it. As such, the correct answer to the question is 'B) Cooperative'.