REITs Don't Have to Pay Corporate Income Taxes, but in Return

REITs don't have to pay corporate income taxes, but in return they face what major restriction?

A) They have to hold at least 50% of their assets in government bonds.
B) They have to sell any properties they develop within four years of the date of completion of construction.
C) Their directors must agree not to accept invitations to spend the night in the White House, except under a Republican administration.
D) They have to pay out 90% or more of their annual taxable income in dividends.