Suppose the Market Demand Function for Ice Cream Is Q^d

Suppose the market demand function for ice cream is Q^d = 10 - 2P and the market supply function for ice cream is Q^s = 4P - 2,both measured in millions of gallons of ice cream per year.Suppose the government imposes a $0.50 tax on each gallon of ice cream.The producer surplus after the tax is:

A) $3.56 million.
B) $4.50 million.
C) $1.89 million.
D) $7.11 million.