Which of the Following Choices Most Accurately Describes the Echo

Which of the following choices most accurately describes the echo chamber?

A) The echo chamber is used by most firms in the United States and relates to a firm's ability to repeat an advertising message.
B) The echo chamber relates to ensuring that viewers receive factually correct information.
C) The echo chamber speaks to a firm's ability to ensure customers make repeat purchases.
D) The echo chamber speaks to being surrounded only by information that agrees with one's viewpoint.