Answer:
Option: He oversaw Japan’s rapid territorial expansion.
Explanation:
Japanese emperor Hirohito during World War II oversaw Japan territorial expansion in Asia and the Pacific Ocean. Japan became a powerful nation with its Imperial Japanese Army in the 1930s. Hirohito took his country towards militarism and ultra-nationalism. The main purpose of the Japanese Imperial Army was to become a superpower in Asia. America began a fight with Japan when the Japanese Air Force attacked Pearl Harbor to take control over the Pacific Ocean.