1- The correct answer is B.
In 1931, Japan invaded and conquisted Manchuria (northen China). The Japanese claimed that they were liberating the local Manchus from China. Their occupation lasted until the Soviet Union and Mongolia launched the Manchurian Strategic Offensive Operation in 1945.
In 1937, the Second Sino-Japanese War started after the Marco Polo Bridge Incindent. During this war, the Empire of Japan moved into the territories of Southern China.
2- The correct answer is B.
The Second Sino-Japanese War had caused tension between Japan and the United States, which lead to an overall disaproval of the Empire. That, along with the occupation of French Indochina in the years of 1940–41, and the continuing war in China led to America placing an embargo on strategic materials such as scrap metal and oil. Since the United States was their main exporter, Japan lacked this important materials needed to produce new naval ships and to use them propertly in the war.
3- The correct answer is A.
In 1941, the Empire of Japan made a surprise attack on Pearl Harbor. The main purpose was to destroy the US Pacific Fleet and weaken the resolve of the American people. The Japanese people believed that this attack would be so brutal for the United States that they would refrain from interfering in their quest to conquer Southeast Asia.