Assume There Are Three Hardware Stores,each Willing to Sell One

Assume there are three hardware stores,each willing to sell one standard model hammer in a given time period.House Depot can offer their hammer for a minimum of $7.Lace Hardware can offer the hammer for a minimum of $10.Bob's Hardware store can offer the hammer at a minimum price of $13. Given the scenario described,if the market price of hammers decreased from $15 to $11:

A) total producer surplus would fall by $4.
B) producer surplus for each producer falls by $4.
C) House Depot's producer surplus falls by $4.
D) total producer surplus falls by $8.