As a result of the black death in western europe:
a) poor people fled the cities to live as serfs on manors
b) the church became more interested in medical science
c) the supply of laborers decreased while demand increased
d) all of the above

i believe its D

Explanation:

Hope it helps!

they were unable to pay their debts

the east coast has nothing to do with the dust bowl, the dust bowl killed a full year's worth of crops in seconds, and with the dust on the land, the land would be worthless.   furthermore the farmers couldn't  get  out of their houses due to the dust so when the bank came to collect money, farmers couldn't  pay it

disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.