I am pretty sure it is c, i hope i helped
Sorry if i'm late but the answer is C.
The main reason Japan invaded Manchuria in 1931 is because <em>it wanted raw materials and natural resources</em>. Japan was facing economic crises during the period due to high tariffs imposed on their goods by United States, China and other countries which were big markets for Japanese goods. Japan was trying to increase its industrial productivity and strength because trade what its economy’s main part. So, Japan assumed that the only way to face it was creating an empire by force and consequently attacked Manchuria on the excuse of sabotage of their railway line in Manchuria by Chinese army.
The answer would be redbank