Final answer:
Corporations make up 20% of all businesses and account for 81% of U.S. business receipts, offering liability protection and the ability to raise capital through shares (A).
Step-by-step explanation:
Corporations comprise about 20% of all businesses but account for about 81% of U.S. business receipts. Corporations are business entities that are legally separate from their owners, providing protection from liability for individual owners and allowing these businesses to raise capital through the sale of shares.
This structure is different from sole proprietorships and partnerships, where the business is not a separate entity and the owners can be held responsible for debts and liabilities. In the U.S. economy, corporations play a significant role in job creation, technological advancement, and generating tax revenues.