The Mongols invaded Korea, known as Goryeo at the time, on several occasions between the years of 1231 and 1270. Which statement is true of those invasions?
A.
The Mongols lost nearly all of their soldiers to a superior Korean army.
B.
Korea was ruled by the Mongol Yuan Dynasty for many years.
C.
Korea defeated the Mongols with the help of the Chinese military.
D.
The Mongol forces were destroyed by a typhoon off the Korean coast.