To Determine Whether a Firm Is Experiencing Economies of Scale

To determine whether a firm is experiencing economies of scale, diseconomies of scale, or constant returns to scale, one would examine the _____ relationship between _____.

A) short run; the quantity of input and the average variable cost
B) short run; the quantity of output and the average total cost
C) long run; the quantity of input and the average variable cost
D) long run; the quantity of output and average total cost