Answer:
Korea was able to fend off the multiple invasions but at an extreme toll to infrastructure and civilian life. Eventually they became a vassal state of the Mongol Yuan dynasty.
Step-by-step explanation:
This seems to be a question that should have multiple choice answers posted but I will do my best to answer it regardless. Korea was successfully able to repel the different Mongol invasions that they experienced between 1231-1273 although ultimately what is today Korea (then called the Kingdom of Goryeo) was overcome and became a vassal state of the Mongol Yuan dynasty. This condition lasted for about 80 years with intermarriage between the Khan family and the Goryeo dynasty and this way the Goryeo dynasty survived. Beginning in the 1350s, the Goryeo were able to push the Mongolian garrisons back, but the Yuan Dynasty was facing large rebellions in China.