The correct answer is D. Grow crops as a food source.
Step-by-step explanation
Agriculture is a human activity in which seeds are sown in the soil for a plant to grow, and in this way, use parts of the plant such as fruits, leaves, roots, etc. as a food source or for trading purposes. This activity is one of the oldest in humanity, and one of the most revolutionary because it marked the beginning of an era with a sedentary lifestyle. Indeed, before agriculture, human communities had to move from one place to another in search of resources for their survival but once agriculture was discovered and animals were domesticated communities settled in one place, which allowed them to develop important cultural aspects. So, the correct answer is D. Grow crops as a food source.