What Was the Result of the Invasion of Manchuria by Japanese

What was the result of the invasion of Manchuria 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 World War II.
D) They took control of this unclaimed land because they saw it as an opportunity to have a warm water port on the mainland.
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.