What hypothesis might you form based on the fact that a primitive language has never been discovered

I'd assume as there is no evidence of a primitive language, there wasn't one and/or they only communicated verbally and had no writing system.

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.

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