Recently, a Major Newspaper Had to Temporarily Shut Down Its

Recently, a major newspaper had to temporarily shut down its blog because of numerous anonymous posts that were highly offensive, much more offensive than any signed letter or posting. What is the best explanation as to why these online contributions were more offensive than signed letters?

A) Being online led to a sense of deindividuation.
B) It is customary to be rude on the Internet.
C) It is a sign of the times, not due to the technology.
D) People who write in to newspapers tend to be more aggressive by nature to begin with.