What Was the Result of the Invasion of Manchuria, China

What was the result of the invasion of Manchuria, China by Japanese troops in the 1930s?

A) They sought to seize control of the railroad in Manchuria into Russia but were immediately thwarted by Russian forces.
B) They took advantage of China's weakness during a civil war by proclaiming Manchuria's independence.
C) They used Manchuria as a staging ground to invade Russia, thereby marking the beginning of the Second World War.
D) They easily took control of this unclaimed land because it had such little value economically but transformed it into an area that was strategic militarily.
E) They intended to prevent the Chinese from using the port there as a launch point to invade Japan but were thwarted by Chinese forces.