All of the following might cause a nomadic group to move EXCEPT O a scarcity of game
O a change in seasons
O a decline in the population
O lack of food in the environment

A change of seasons. Nomads could just adapt.

Add on:

I hope this helped/did anything lol.

I think its the third one, a decline in the population.

The nomadic group would move if there is a lack of food. They would also move if the seasons change. And they would move if there is a scarcity of game. But they would not move if there is a decreese in their population.

Hope this helps :)

(oh and if its wrong sorry im just going with my gut lol)

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.