Which group was responsible for the fall of the southern song in 1279?

option a

explanation:

to cleberate the end of their war

the dominoes began to fall. the surrender at appomattox took place a week later on april 9. while it was the most significant surrender to take place during the civil war, gen. robert e. lee, the confederacy's most respected commander, surrendered only his army of northern virginia to union gen. ulysses s. grant

explanation:

the government closely monitored its finances to avoid another financial collapse.