Saying That a "Good" Product-Market Segment Should Be Substantial Means

Saying that a "good" product-market segment should be substantial means

A) that the company does not have to worry about substantial competition for a long time.
B) that people should have substantially different reactions to marketing mix variables.
C) it should be large enough to be profitable.
D) that people in different market segments should be as different as possible.
E) None of these choices is correct.