Assume There Are Three Hardware Stores, Each Willing to Sell

Multiple Choice

Assume there are three hardware stores, each willing to sell one standard model hammer in a given time period. House Depot could offer a hammer for a minimum of $7. Lace Hardware could offer a hammer for a minimum of $10. Bob's Hardware could offer a hammer for a minimum of $13.If the market price of hammers increased from $9 to $12, total producer surplus would increase by:

A) $1.
B) $3.
C) $5.
D) $7.