One can obtain bond ratings for all of the following debt instruments except______.
A.municipal bonds
B.corporate bonds
C.central government bonds
D.bonds issued by the state and local governments

A.A.municipal
B.corporate
C.central
D.bonds

【参考答案】

C
解析：答案为C项。中央政府所发行债券一般没有信用评级。故本题选C项。