The Proliferation of News Sources in Recent Years Has

The proliferation of news sources in recent years has

A) discouraged polarization because people can now access a wider array of viewpoints than before.
B) encouraged polarization because many media outlets seek to position themselves within a discrete ideological or partisan niche rather than maintain a middle-of-the-road stance.
C) discouraged polarization because it has eliminated selection bias by journalists.
D) encouraged polarization because it has led to the death of adversarial journalism.
E) had no effect whatsoever on polarization because most Americans are not influenced by media coverage.