Answer:
D. The proliferation of nomadic cultures
Step-by-step explanation:
The proliferation or increase in nomadic cultures could have happened without the ending of the Ice age. Cultures spread and can be made under any conditions. The increase and plants and animals however was due to the ending of ice age, warm temperatures make it easier for plants and animals to survive. The development of farming was also due to the ending of this age since warm temperature makes makes for better soil and better soil means farming overall will develop.