Why was the investiture controversy important.
A- It removed power from the king and increased the power of the nobles.
B- It created a conflict that divided the empire into two.
C- It allowed the pope to unify the kingdoms of Europe.
D- It helped establish the idea of separate areas of power for the church and state.

it helped establish the idea of separate areas of power for the church and state

Explanation:

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.