Which of the Following, If True, Would Be an Example

Which of the following, if true, would be an example of a monopolistically competitive industry?

A) In the utilities industry, average cost declines over all levels of output.
B) In the automobile industry, fixed costs as well as variable costs are high.
C) In the retail trade industry, a large number of firms provide similar products.
D) The market for basic office supplies (pencils, paper, and clips) is served by scores of online suppliers.
E) In the pharmaceuticals industry, the entire market is served by a small number of large firms.