With no explanation, chose the best option from "A", "B", "C" or "D". made clear that “[f]or regulation of employees it is not necessary that the act regulated be anything more than an act reasonably deemed by Congress to interfere with the efficiency of the public service.” United Public Workers v. Mitchell, 330 U.S. 75, 101, 67 S.Ct. 556, 570, 91 L.Ed. 754 (1947). Later, with the full development of Pickering cases into a discrete area of First Amendment law, the Supreme Court reinforced United Public Workers’s holding. In 1983, the Court ruled that a governmental employer is not required to “tolerate action which he reasonably believe[s] would” cause the harm against which the prophylactic measure is directed. Connick v. Myers, 461 U.S. 138, 154, 103 S.Ct. 1684, 1693, 75 L.Ed.2d 708 (1983); see also Sanjour v. EPA, 984 F.2d 434, 440 (D.C.Cir.1993) (<HOLDING>) (internal quotation marks and brackets

A: holding that it is not
B: holding that dismissal is proper for a derivative cause of action but not for a direct cause of action
C: holding that employer is not required to tolerate action which it reasonably believed would cause harm
D: recognizing cause of action
C.