Use the drop-down menu to complete the sentence.(1 point)

1.The Koryo culture declined after Chinese invaders caused destruction that damaged Korea's economy.
2.The Koryo culture declined after Japanese invaders caused destruction that damaged Korea's economy.
3.The Koryo culture declined after Mongol invaders caused destruction that damaged Korea's economy.
4.The Koryo culture declined after Silla invaders caused destruction that damaged Korea's economy.

1.The Koryo culture declined after Mongol invaders caused destruction that damaged Korea's economy.