econ problems I need you help

Question 12 Total surplus A. can be used to measure a market's efficiency. O B. is the sum of consumer and producer surplus. O C. is the value to buyers minus the cost to sellers. O D. All of the above.Question 13 4 points Save Answ The price elasticity of demand for tickets to Mason football games is -3. At the prevailing price of $10 per ticket, the quantity of tickets demanded exceeds the stadium's seating capacity. The quantity of tickets demanded must fall by 30% to equal the total number of seats available. To eliminate the shortage of seats, the price of tickets should be O A. decreased by $1. O B. increased by $1. O C. decreased by 596. O D. increased by 596