The yellow river (huang he river) is sometimes referred to as "china's sorrow." what would be the best explanation for this sad nickname?
a)it was the site of the communist revolution in 1949.
b)flooding has caused massive human and property loss over time.
c)it has re-routed to force people to follow the communist government.
d)the yellow river became dry after construction of the three gorges dam.

It's B) Flooding has caused massive human and property loss over time.  

Explanation: USAtestprep said it was correct

answer; (d) none of the above;

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.