The correct answer is B. Answer B gives one of the two primary reasons listed in the Handbook for disclosing referral fees to clients under Standard VI(C)– Referral Fees. (The other is to allow clients and employers to evaluate the full cost of the services.)

Answer A is incorrect because Standard VI(C) does not require members or candidates to discount their fees when they receive referral fees.

Answer C is inconsistent with Standard VI(C) because disclosure of referral fees, to be effective, should be made to prospective clients before entering into a formal client relationship with them.

B是正确的，这涉及到Standard VI(C)–Referral Fees.披露推荐费用可以使客户或雇主判断CFA会员以及候选人推荐的服务有无偏袒倾向以及帮助客户和雇主评估服务成本，因此B是正确的。

披露推荐费并不会使服务费用打折，因此A错误。

Standard VI(C）要求在与潜在客户建立关系前进行披露，因此C错误。