Answer:
A) $10
Explanation:
Producer surplus is the difference between the least amount sellers are willing to sell their product and the price of the product.
Producer surplus for firm A = $11 -$6 = $5
Producer surplus for firm B = $11 - $7 = $4
Producer surplus for firm C = $11 - $10 = $1
Firm D does not make a producer surplus because the producers minimum price is greater than the market price
Total producer surplus = $5 + $4 + $1 = $10
I hope my answer helps you