请问A选项为啥正确？
问题如下图：
选项：
A. 
B. 
C. 
解释：
NO.PZ2016031101000019 对于债券等级、投向等均有要求，为什么BC就不是对基金经理的限制呢？
the average cret quality must investment gra. securities helin the portfolio must issuein velopemarkets. A is correct. Sua restriction woulmost likely alter portfolio structure anwoulalso likely client specifiThe restrictions in B anC are not necessarily client specific ancoulalrea part of the investment strategy of the manager. (See Section 3.7 of the reang.)请问这个知识点是在讲义的什么地方？
