You can cancel out A. And C. Out which leave two answers. D and B and considering buildings could be a way of adaption along with flood control systems. B makes the most sense.
Answer:
Birth rates might have declined less rapidly in Europe and North America becuase of the upgrade in socioty that started around that time.
Explanation:
Major Gender Imbalance- it will become increasingly harder for a man to find a wife to bear him children.
"Europeans had advanced farming methods, tools, and more powerful weapons."This shows that when a certain population overpowers an existing population in a terrain/land the assailant has powerful technology than the latter. We appreciate your questions. Please, never hesitate to ask more in Brainly your queries.