Your answer should be C.
They aren't necessarily cheaper, nor does it matter about the quantity, they also don't help the land much.
Answer:
In 1279, Kublai became the first Mongol to rule all of China when he conquered the last of the Song loyalists. ... Despite adopting and improving on many Chinese systems and ideals, Kublai and his Mongols did not want to become Chinese – they kept many of their own customs and remained unassimilated to Chinese life
Answer: Sounds are determined by how an object vibrates. ... Sound travels more slowly than light. Sound waves travel at the same speed, but vibrate in different ways. Some vibrate quickly and have a high frequency or pitch, while others vibrate slowly and give a lower pitch
Explanation: WISDOM BOI!!!
Group B is the Central Powers