One of the reasons the reporting of national news is relatively uniform among news source is that

A. The government dictates much of what is reported

B. There are only a few important events each day that merit news coverage

C. The network newscasts are brief and the day's top stories tend to dominate

D. Reporters are not given much freedom by their editors

B. There are only a few important events each day that merit news coverage.

Explanation:

The news sources strive to report important news, thereby making the reporting of the stories relatively uniform. These important stories would be broadcast by the network newscasts but in various dimensions.

The major reason for uniformity among news source is that important daily events are few, and these are what the majority of people intend to be abreast of. No one is interested in irrelevant stories.

A good example is the case of the corona virus 2019 that has bedeviled the whole world at present, most networks broadcast this and a few other stories. This is because they intend to report what majority of their followers wish to know and there are few important stories for the day.

The correct option is C

Explanation:

The major reason why there is relative uniformity in the national news source is because the number of news organization and news services are responsible for generating most of the news, hence the option that network newscast are brief and hence the days top stories tend to dominate is the best option.