Explanation:
A. Assuming the price of ceiling $40 and the equilibrium price is $30 is ineffective. Therefore the ceiling price is higher that equilibrium price, it will affect the same number attending the classical music concerts if no control on price.
B. Assuming the price of ceiling $40 and the equilibrium price is $40, the prices will not affect due to cost is same. So, it will cause that the same number of people will attend the classical music concerts that if no control on price.
C. Assuming the price of ceiling $40 and the equilibrium price is $50 is effective. Thus, price ceiling is below equilibrium price. It will result into that few number of people will attend the classical music concert that if no control on price.
Therefore, the price ceiling on concert attendance:-
The equilibrium price of $30 = Same
The equilibrium price of $40 = Same
The equilibrium price of $50 = Less