If successful, $q,$ can be efficient because production, research, and promotion costs benefit from economies of scale$-$it's cheaper to develop one product or one advertising campaign than to choose several targets and create separate products or messages for each. But the company must be willing to bet that people have similar needs so the same product and message will appeal to many customers.

A$.$ an undifferentiated targeting strategy

B$.$ a concentrated targeting strategy

C$.$ a customized marketing strategy

D$.$ a differentiated targeting strategy

E$.$ mass customization