Which of the following is the source of 20 producer surplus

Last updated: 10/6/2023

Which of the following is the source of 20 producer surplus O a A producer plans to sell a 20 item but the customer changes his mind and does not buy O b A store has 300 of stock but could have sold 320 worth if it had been available O c A store acquires 300 of stock but is only able to sell 280 of it O d A producer is willing to sell an item for 100 but manages to sell it for 120