问题如下图：
选项：
A. 
B. 
C. 
解释：
老师能解释下这道题内容吗？看的不是很明白
NO.PZ2016032801000028 问题如下 Carter works for Invest Toy, a locasset management firm. A broker thprovis Carter with proprietary researthrough client brokerage arrangements is offering a new trang service. The broker is offering low-fee, execution-only tras to complement its trationfull-service, execution-anreseartras. To entiCarter another asset managers to senaitionbusiness its way, the broker will apply the commissions paion the new servitowarsatisfying the brokerage commitment of the prior full-serviarrangements. Carter halways been satisfiewith the execution provion the full servitras, anthe new low-fee tras are comparable to the fees of other brokers currently usefor the accounts thprohibit soft llarrangements. A.Carter ctra for his accounts thprohibit soft llarrangements unr the new low-fee trang scheme. B.Carter cannot use the new trang scheme because the commissions are prohibitethe soft llrestrictions of the accounts. C.Carter shoultra only through the new low-fee scheme anshoulincrease his trang volume to meet his requirecommission commitment. A is correct.The question relates to StanrIII(–Loyalty, Prunce, anCare. Carter believes the broker offers effective execution a fee this comparable with those of other brokers, so he is free to use the broker for all accounts. Answer B is incorrebecause the accounts thprohibit soft llarrangements not want to funthe purchase of researCarter. The new trang scheme es not incur aitioncommissions from clients, so it woulnot go against the prohibitions. Answer C is incorrebecause Carter shoulnot incur unnecessary or excessive \"churning\" of the portfolios (excessive trang) for the purpose of meeting the brokerage commitments of soft llarrangements. To entiCarter another asset managers to senaitionbusiness its way, the broker will apply the commissions paion the new servitowarsatisfying the brokerage commitment of the prior full-serviarrangements.这段话怎么理解呢，就是用仅收交易的佣金，提供交易和研究的全方位服务？超额提供服务？另外comparable 是可比较的意思，在这个上下文里就是相当的意思吗，说明和其他不提供软美元的账户，费率基本一样？
Carter cannot use the new trang scheme because the commissions are prohibitethe soft llrestrictions of the accounts. Carter shoultra only through the new low-fee scheme anshoulincrease his trang volume to meet his requirecommission commitment. A is correct. The question relates to StanrIII(–Loyalty, Prunce, anCare. Carter believes the broker offers effective execution a fee this comparable with those of other brokers, so he is free to use the broker for all accounts. Answer B is incorrebecause the accounts thprohibit soft llarrangements not want to funthe purchase of researCarter. The new trang scheme es not incur aitioncommissions from clients, so it woulnot go against the prohibitions. Answer C is incorrebecause Carter shoulnot incur unnecessary or excessive \"churning\" of the portfolios (excessive trang) for the purpose of meeting the brokerage commitments of soft llarrangements. 请翻译下a项的中文意思，谢谢？
可能是理解有问题，麻烦您做一下吗
题干中最后一句话的soft llinvest ment是什么意思，和前面的描述有什么联系呢。
