The area that represents producer surplus when the price is p1 is A. BCE.
What is the area?
Producer surplus is a concept in economics that finds the benefit producers receive when they sell their goods or services for a price that is higher than the minimum they were willing to accept.
This metric represents the extra profit producers will make due to favorable market conditions. In the picture indicated below, the area that represents the producer surplus is BCE. Graphically it is the triangular area above the supply curve and below the market price on a supply and demand graph.