Why did metternich urge conservative leaders to suppress revolutionary ideas

Throughout his long career, Metternich was a firm conservative, opposed to the liberal and pro-revolutionary movements, dedicating himself to the defense of European monarchies, being through the Congress of Vienna the architect of the "Iron Europe" », Which restored the Old Regime throughout the different countries of the continent, after the fall of the Napoleonic Empire. He believed that conservative governments would defend the peace and stability of the states.

i believe it is capitalists.  

i would say your answer is a)

sorry if im wrong