Question

complete the analogy.
detective is to investigate as
advertisement is to
slogan
promote
purchase

Explanation:

To complete the analogy, we analyze the relationship between the first pair: a detective's action is to investigate. Now, for an advertisement, its main action or purpose is to promote (a product, service, etc.). A slogan is part of an advertisement, not the action of an advertisement. Purchase is the action of a customer, not the advertisement. So the correct word is "promote" as it shows the action - entity relationship similar to detective - investigate.

Answer:

promote