(Table: Variable Costs for Lots) Look at the Table Variable

(Table: Variable Costs for Lots) Look at the table Variable Costs for Lots.During the winter, Alexa runs a snow-clearing service, and snow clearing is a perfectly competitive industry.The table provided shows her variable costs for snow clearing and number of lots cleared.Her only
fixed cost is $1,000 for a snowplow.Her variable costs include fuel, her time, and hot coffee.What is Alexa's shut-down price in the short run?
A.$20
B.$15
C.$50
D.$42