Which of the Following Is a Consequence of Rent Controls

Which of the following is a consequence of rent controls established to keep housing affordable for the poor?

A) Less rental housing is available as prospective landlords find it unprofitable to rent at restricted prices.
B) The quality of rental housing declines as landlords lack the funds and incentive to maintain properties.
C) Apartment buildings are torn down in favor of office buildings,shopping malls,and other buildings where rents are not controlled.
D) All of the above are consequences of rent controls.