The fourth alternative is correct (D).
The role of the media in an election is to demonstrate in an unbiased way the ideas of the campaign candidates to voters so that they make their choices based on the convergence of principles and ideas.
However, media production is done by human beings, who have their own perceptions about what is relevant in the electoral context. In addition, the media is segmented, so that it is natural in one debate, one business newspaper to focus on economic issues while another focuses on something that it considers problematic, such as the issue of immigration.
In this way, it is concluded that the media focuses on different aspects of a story and is capable of shaping public opinion. This has a natural character derived from the purpose of the vehicle and human nature, but it can also be purposeful, in order to influence public opinion.