What is it called when a bank does not have enough money to pay back its depositors?

the answer is d) unified country hopes this

the foundation of greek city-states: following the fall of the mycenaean civilization in the 10th century bc, the area surrounding the empire went through its own mini dark ages. answer and explanation

the answer would more than likely a.)falling crop prices  

hope the answer is right and ,either way have a nice day.

the railroad administration