What was the significance of the 38th parallel before the korean war?

a. when us troops moved north of it, the chinese decided to fight.

b. it was the location of the yalu river boundary between north korea and china.
c. it served as the boundary between north korea and south korea.

d. it marked the first site of the north korean aggression.

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.

the main reason the us senate rejected the treaty of versailles was because "european nations wanted to punish germany"

d(:

me and mark as brainliest.