What was the overall strategy of America and its allies in World War II?

The United States entered the Second World War with a Germany-first strategy.

Explanation:

Germany first was the key element of the grand strategy agreed upon by the United States and the United Kingdom during World War II

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.