Coal-burning factories and increased automobile usage has caused the greatest increase in "<span>A) air pollution," since in fact coal when burned is one of the worst pollutants. </span>
I believe the answer is: B.because of advances in science, medicine, technology, and the arts
During the hand civilization, China developed many advancement in use of herbs for medicinal purpose and adopted many technology from all across the world which increase their agricultural production capacity.
Their artworks were also developed to the point where it became a hot commodity among European nobles.