HELP, GIVING BRAINLIEST!
What, in addition to geographic boundaries, might have kept the people of the Huang River civilization from traveling to far-distant regions?

A. They feared that their bronze weapons would be no match for the iron weapons of ancient Egypt.
B. They could get everything locally that they needed to survive and grow.
C. They had learned about the other river valley civilizations but feared contact would bring invasion.
D. They had not yet developed a system of money based on coins.

they had not yet developed a system of money based on coins

Explanation:

D

B. They could get everything locally that they needed to survive and grow.

Explanation:

b: the establishment clause  

b: socialism  

both are true, the congress does have the power to create banks, even if this power is not specifically described in the constitution, since there is nothing restricting it and there is power given to the congress to make "all laws which shall be necessary and proper". maryland was not allowed to tax a branch of the national bank operating there, and the supreme court decided that no state could. both of these topics were discussed in a decision of the mcculloch v. maryland case in 1819.