The correct options are
A Animals move from place to place. So, the hunters had to follow the animals.
B Plants and trees bear fruits in different seasons. So, the people kept moving in search of new places.
D People living near river banks search a new place during dry seasons.
The life of the nomadic hunter-gatherers is determined by three main factors:
Movement of the animals: Animals move from place to place. So, the hunters had to follow the animals.
Weather: Plants and trees bear fruits in different seasons. So, people kept moving in search of new places.
Geography: People living near river banks search for a new place during dry seasons.