The main reason for the shift from foraging to farming occupation was domestication. This process involved selecting and breeding plants and animals for desirable traits, leading to the development of agriculture.

Reasons for the Shift:

1. Domestication: Domestication refers to the process of adapting wild plants and animals for human use. This process led to the development of agriculture as it allowed humans to produce a reliable food supply. As humans began to settle in one place, they started to plant crops and raise animals, leading to the development of agriculture.

2. Sedentary Lifestyle: Domestication led to the development of a sedentary lifestyle for humans. With a reliable food supply, humans could settle in one place and focus on other activities like building permanent homes and developing crafts.

3. Population Growth: Agriculture allowed for the production of surplus food, leading to a population boom. As the population grew, there was a need for more food, which led to the expansion of agriculture.

4. Technological Advancements: Agriculture led to the development of new technologies like irrigation systems, plows, and harvesting tools. These advancements increased food production and made farming more efficient.

5. Social and Cultural Changes: Agriculture led to social and cultural changes as it allowed for the development of complex societies. With a reliable food supply, humans could specialize in different occupations like artisans, traders, and soldiers.

Conclusion:

In conclusion, the shift from foraging to farming occupation was mainly due to domestication. This led to the development of agriculture, a sedentary lifestyle, population growth, technological advancements, and social and cultural changes.