Use the Following to Answer Question

Multiple Choice

Use the following to answer question:
-(Table: Lunch) Use Table: Lunch.This table shows market demand for picnic lunches for people taking all-day rafting trips on the river.Suppose that the marginal cost and average cost of each lunch are a constant $4 for all firms in the market.What is consumer surplus in this market in the long run?

A) $4
B) $10
C) $180
D) $360