The correct response is:
The corporation is taxed, and then shareholders are additionally taxed.
In a corporation, the business itself is subject to corporate income tax on its earnings. After the corporation pays taxes on its profits, any dividends distributed to shareholders are taxed again at the individual level, leading to double taxation. In contrast, sole proprietorships and partnerships typically don't pay taxes at the business level; instead, profits and losses "pass through" directly to the owners, who report them on their personal tax returns.