From 800���1200, the khmer and mon peoples moved into the northern regions of
a. thailand.
b. vietnam.
c. cambodia.
d. myanmar.

The great migration between 800 and 1200 saw people of khmer and mon ethnicity move into the northern region of modern day Myanmar - D. 

Following this, they were able to survive and live were, although not without great difficulties.

The dangers of an inadequate monetary supply.

The answer is a and hi how are you doing