A small private college situated in a rural geographic setting, a research lab at a bio-tech company and an attorney could all be considered:

a. too diverse to be audiences for advertising.

b. not aligned, therefore not efficient.

c. appropriate audiences for an advertising campaign.

d. too complex to be reached by pure advertising.

The correct answer to the following question is C) Appropriate audience for an advertising campaign.

Explanation:

When a company wants to sell its product in the market, it is very important for them to understand who their target market or target audience are, because these are the people who are in interested in buying company's product not everyone in the market. So it becomes very important for the company to identify who their target audience are and to make a connection with them, so that they can be influence in to buying the company's product.

And in the given above question all of them are example of target audiences.