One of the greatest challenges facing South Asia is a.
reducing tensions between Buddhist and Muslim groups.
b.
growing enough food to feed its population.
c.
stemming the flow of the population moving out of the region.
d.
improving rail transportation throughout the region.

b. growing enough food to feed its population.

Explanation:

one of the greatest challenges facing South Asia is growing enough food to feed its population.

a) it is located in central mexico.

the correct answer is the following is a list of inventions made in the medieval islamic world, especially during the "islamic golden age" (8th to 13th centuries),[1][2] as well as the late medieval period, especially in the emirate of granada and the ottoman empire.

science and technology in the islamic world adopted and preserved knowledge and technologies from contemporary and earlier civilizations, including persia, india, china, and greece-roman antiquity, while making a number of improvements and innovations.