The shift from mass marketing to targeted marketing, and the corresponding use of a larger, richer mix of communication channels and promotion tools .

Poses a problem for marketers

Explanation:

When there is a shift from mass marketing to a more targeted approach, there will be a need for different promotional tools to reach each target audience.

For example use of social media to get to youths, use of magazines and newspapers to get to the more mature customers.

If the promotional tools become many with different messages, customers tend to get confused about what the product can offer them.

They will tend to move to other companies that communicate clearly the benefits of their products.

the answer is account d

answer the law of increasing costs;