In April 1917, the Germans Moved to Destabilize Russia by

In April 1917, the Germans moved to destabilize Russia by

A) sending agents to blow up railway tracks, provoking a tsarist crackdown on dissidents.
B) using submarines to cut off the Russian supply lines in the Baltic Sea.
C) distributing leaflets and forged documents in Russia that purportedly proved that Nicholas II planned to reimpose serfdom.
D) providing safe rail transportation back to Russia for V. I. Lenin and other Bolsheviks.