After larger groups began to settle and tend crops, the most relevant outcome from your options is:
The need for labor to farm crops increased.
This transition from a nomadic lifestyle to settled agriculture marked the beginning of the Agricultural Revolution, which led to the development of more complex societies. As people began to farm, they required more labor to tend to the crops, leading to the establishment of communities and, eventually, more organized forms of governance and social structure. This also facilitated the growth of population and the ability to support larger groups of people.
While it is true that organized groups migrating to follow animals was a characteristic of earlier nomadic lifestyles, the shift to agriculture fundamentally changed human social dynamics. The other options regarding technology development, organized migration, and family structures do not accurately reflect the primary outcomes associated with the settling of agricultural communities.