Why Was the Third Republic So Unstable Despite Its New

Why was the Third Republic so unstable despite its new democratic institutions?

A) Monarchist elements within society used the new mass journalism to undermine the authority of the legislature and of successive prime ministers.
B) Economic downturns, widespread corruption, and growing anti-Semitism, fueled by a highly partisan press, kept the republic on shaky ground.
C) After the Paris Commune, Marxism gained ground within France, and the working-class parties threatened France's political stability with constant strikes.
D) The Catholic church regained a loyal following and struck back against the Third Republic's secularizing policies.