Answer:
B
Explanation:
Ceylon is in Sri Lanka and big mountains don't make conquering easier.
I think D, because it talks about prompting more people to migrate.
The economic health of Egypt will be affected by its population as (B) it will need to grow its economy faster than its population. As the population grows, with increasing birth rates, the economy needs to grow bigger in order to support the food, work and health needs of the populous.