Use the Figure Below to Answer the Following Question

Multiple Choice

Use the figure below to answer the following question. Figure 10.4.3
-Refer to Figure 10.4.3 which shows a firm's long-run average total cost curve.When production increases from Q₁ to Q₂ sweaters per day,the firm experiences

A) a decrease in fixed costs.
B) economies of scale.
C) diseconomies of scale.
D) constant total costs.
E) constant returns to scale.