When reading the long-run cost curve from left to right, which is the correct order of economies of scale as reflected in the curve? Cost (in dollars), ATC, Long-Run Cost Curve ATC, ATC ATC ATC, ATC 0 150 275 350 450 650 800 900 Quantity of Output (a.) Constant returns-to-scale. economies of scale, diseconomies of scale O b.) Economies of scale, constant returns-to-scale, diseconomies of scale ( ) constant returns-to-scale. diseconomies of scale, economies of scale d.) Diseconomies of scale, constant returns-to-scale. economies of Scale