Why Did the Supreme Court, in the Case of United

Why did the Supreme Court, in the case of United States v. Nixon, reject Nixon's claim that he had a right to refuse to disclose confidential information?

A) That right did not extend to a Justice Department investigation if the release of information did not compromise national security.
B) No such power was granted to the executive branch under the Constitution, and thus withholding information was unconstitutional.
C) That right could not apply in any case involving information critical to questions of policy, even if the release of information compromised national security.
D) Such a right applied only to requests for information by Congress, and not to requests for information by the courts through a subpoena.