Answer:
a) a partnership
Explanation:
-A partnership is when two or more parties share a business operation and its profits.
-A joint venture is when two or more parties make an agreement to share their resources to be able to reach a specific goal.
-A sole proprietorship is when one person owns a business, takes all the profits and has an unlimited responsability.
-A limited liability corporation is a business created by two or more parties in which their liability is limited to the amount invested.
According to this, the answer is that given only these facts, the business organization of their law practice is a partnership because the business was created by two parties that have control over the operation and share the profits.