What major crisis began when this security guard noticed tape covering locks on doors leading to an underground parking garage sometime after midnight on june 17, 1972, and decided to call the police?
a. the energy crisis
c. the salt i crisis
b. iran-contragate
d. watergate?

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

hope this .

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