Marketers believe that customer satisfaction results in more sales. However, as the segment of buyers gets larger, it becomes more heterogenous and dissatisfaction increases. The best advice to marketers is $\_\_\_\_\_\_\_\_.$

a$.$ to continue to make the target market more heterogenous

b$.$ to serve a larger market share with more customer differences

c$.$ to re$-$segment

d$.$ to please all customers with a single market offering