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C. Diseases spread through American Indian communities

its c

Explanation:

Once they arrive the europeans were very unhygienic during the time they arrived to America there were many diseases in Europe in which case they europeans had transmitted diseases to the Indians.

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.