The correct answer is the following: Option A. A way in which the media influences what people think and care about is by covering some issues and personalities more frequently, making them seem more important.
Although to some extent all of the options provided in the question could apply, option A is the best one to describe how media uses its influence to shape how people think. By choosing what issues and stories to cover, media companies are making sure that people are watching, repetitively, the same personalities and the same topics, making these ones seem important and relevant. People tend to care and think about those issues that appear in the media outlets, compare to those ones that do not.
