问题如下：
A central bank that decides the desired levels of interest rates and inflation and the horizon over which the inflation objective is to be achieved is most accurately described as being:
选项：
A.target independent and operationally independent.
B.target independent but not operationally independent.
C.operationally independent but not target independent.
解释：
A is correct.
The central bank described is target independent because it set its own targets (e.g., the target inflation rate) and operationally independent because it decides how to achieve its targets (e.g., the time horizon).
考点：Independence of central bank
解析：题目的表述属于“target independent and operationally independent. ”，因为它不仅提出了独立目标，并且提出如何独立实施这些目标，所以A选项正确。
请问老师 ，讲义中the horizon over which the inflation objective is to be achieved是属于target independence，这道题为什么不选B呢？
