In Which of the Following Situations Is It Appropriate for a Firm

In which of the following situations is it appropriate for a firm to become a mass marketer?

A) The market is large and consists of several segments that are almost equal in size.
B) Heavy users make up such a large proportion of the sales volume that they are the only relevant target.
C) The largest segment is composed of light users, and hence, targeting them would yield the highest profits for the firm.
D) Potential consumers constitute such a small group that they don't form a meaningful segment.