The Given Graph Shows the Cost C, in Thousands of Dollars

Multiple Choice

The given graph shows the cost C, in thousands of dollars, of a production run for a product when x machines are used. Estimate the company's fixed cost of production to the nearest thousand dollars, and determine the number of machines that will result in maximum cost for the company. ​ ​

A) fixed production cost: $6,000 maximum cost when 4 machines used
B) fixed production cost: $9,000 maximum cost when 4 machines used
C) fixed production cost: $5,000 maximum cost when 4 machines used
D) fixed production cost: $6,000 maximum cost when 6 machines used
E) fixed production cost: $5,000 maximum cost when 6 machines used