Which of the Following Cost Curves Demonstrate Increasing Returns to Scale

Multiple Choice

Which of the following cost curves demonstrate increasing returns to scale?

A) a vertical long- run average cost curve
B) an upward- sloping long- run average cost curve
C) returns to scale have nothing to do with the shape of the long- run average cost curve
D) a horizontal long- run average cost curve
E) a downward- sloping long- run average cost curve