问题如下：
Which of the following factors in credit analysis is more important for general obligation non-sovereign government debt than for sovereign debt?
选项：
A.Per capita income
B.Power to levy and collect taxes
C.Requirement to balance an operating budget
解释：
C is correct.
Non-sovereign governments typically must balance their operating budgets and lack the discretion to use monetary policy as many sovereigns can.
这个题目看不太懂，能否全面解释一下
