Answer:
A. the difference between the lowest price a firm would have been willing to accept and the price it actually receives.
Explanation:
Producer surplus is the measure of the welfare of the producer.
producer surplus is defined as the difference between the lowest price the company or a firm is willing to accept and the price that is received by the firm actually.
It is also shown by the graph of Price v/s Quantity. The area of this graph represents the Producer Surplus.