What are the possible results of changing from hunting and gathering to agriculture?

A、It forced the population to abandon the nomad’s life and settle down.
B、It might promote the development of the population’s methods of storage, and, often, systems of irrigation.
C、With farming, agriculturalists always had the option of moving elsewhere when the resources were exhausted.
D、The state of health of hunter-gatherers was worse than that of their contemporary agriculturalists.