A and B would work. In developed countries, women have less children, as the education system is better. Also, the same is for B.
Agriculture and pastoralism<span> began to transform human societies. </span>Pastoralism<span> and</span>agriculture led<span> to more reliable and </span>abundant food supplies<span> which increased population. Surpluses of </span>food<span> and other goods </span>led<span> to specialization of labor, including new classes of artisans and warriors, and the development of elites</span>
