Farmer Jones Knows That the Marginal Cost to Produce a Bushel

Farmer Jones knows that the marginal cost to produce a bushel of tomatoes is $5 per bushel. He also knows that a consumer is willing to pay a maximum of $9 for the bushel. The price of the bushel is $6 and Farmer Jones sells his bushel for $6. On this bushel, Farmer Jones earns a producer surplus equal to

A) $1.
B) $3.
C) $5.
D) $6.