The correct answer to 1 is the ability to easily raise financial capital.
A sole proprietor is limited to the cash that they personally have, so this is a disadvantage when they need additional capital for the business.
The correct answer to 2 is that their personal property can be used to pay debts.
A partnership is personally responsible for the debts of the company. If the company owes money and cannot pay it, the partners that own the business are personally responsible.
The correct answer to 3 is the shareholders.
The shareholders are the owners of the corporation. They vote for a board of directors who in turn oversee the operation of the corporation.