Why did japan attack the United States
a. The United States was interfering with Japan’s plan to expand its empire.
b. The United States has sent troops to Southeast Asia to support Britain.
c. The United States was threatening to bomb the Japanese mainland.
d. Japan wanted to gain control of Hawaii.

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.