Answer:
d. controlled circulation
Step-by-step explanation:
Controlled circulation refers to a type of distribution of a newspaper or magazine to a group of select individuals. Most of the time, these magazines are free, and they are delivered only to a small group that belongs to a particular audience of special interest to advertisers. The advantage of such a type of circulation is that there is a high level of certainty that advertisements will be received by the target audience, who are more likely to purchase the products advertised by the magazine.