Answer:
D. Earnings of the corporation are subject to double taxation.
Regular corporations, not S corporation, are subject to double taxation, because the are taxed on corporate income, and taxed on dividends: stockholders pay a dividend tax when these are distributed.
E. Ownership and management are often separated.
In most corporations, specially those that are very large, management and owners are different people, something that creates the principal-agent problem: the agent (management) may not always work in the best interest of the principal (the owner) because their interests are not fully aligned.