Refer to the following graph.

This set of cost curves is:

A$)$ wrong because the average fixed cost curve is drawn incorrectly.

B$)$ wrong because the average fixed cost curve is shown to be below the average variable cost.

C$)$ wrong because the average total cost and the marginal cost curves are reversed.

D$)$ correct.

A monopolistically competitive industry has:

A$)$ many firms producing differentiated products.

C$)$ a few firms producing differentiated products.

B$)$ many firms producing identical products.

D$)$ a few firms producing identical products.

Refer to the graph shown. The output range in region c is associated with:

A$)$ economies of scale.

C$)$ constant returns to scale.

B$)$ diminishing marginal productivity.

D$)$ diseconomies of scale $s$