Rent control is an example of a "price ceiling", it sets the price of rent "below" the equilibrium price and results in a "shortage" of apartments.
Answer is "D".
Rent control is a type of value control that confines the sum a property proprietor can charge for leasing a home or other land. Rent control goes about as a price ceiling by keeping rents either from being charged over a specific level or from expanding at a rate higher than a predetermined percentage.
Equivalent units of production are used when some goods have not been fully processed but costs need to be attached to them. The incomplete ones will be converted to complete goods depending on how far along the production process they are.
Equivalent units for conversion costs = Transfers out during October + Ending WIP * Percentage completion