A firm's are costs that increase as quantity produced increases. These costs often show illustrated by the increasingly steeper slope of the total cost curve.

The question is incomplete.

Choose from the following;

a. variable costs; constant returns to scale

b. fixed costs; opportunity costs

c. fixed costs; technological changes

d. variable costs; diminishing marginal returns

The answer is d. variable costs; diminishing marginal returns

Explanation:

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Explanation: