Why Was the Supreme Court Case New York Times V

Why was the Supreme Court case New York Times v.Sullivan (1964) significant?

A) The justices ruled that a newspaper had to print false and malicious material deliberately in order to be guilty of libel.
B) The justices ruled that newspapers could be guilty of libel if they published any information that was ultimately proven to be inaccurate.
C) The justices ruled that the government could prevent the publication of newspapers and magazines only under the most extraordinary circumstances.
D) The justices ruled that "shield laws" were unconstitutional.