问题如下图：
选项：
A. 
B. 
C. 
解释：
老师，这题我有点不明白题目中说了这份基金是invests solely in long-term us treasury（只投了长期的美国国债）, 那也就是说第一没有违约风险， 第二回报也应该是固定的呀。 为什么答案里说回报不固定呢？ 因为我理解的是，在买长期国债时，每一期的coupon是固定的嘛。 请问我哪儿没理解对吗？
NO.PZ2016032801000016问题如下Grey recommen the purchase of a mutufunthinvests solely in long-term US Treasury bon. He makes the following statements to his clients:I. \"The payment of the bon is guaranteethe US government; therefore, the fault risk of the bon is virtually zero.\"II. \"If you invest in the mutufun you will earn a 10% rate of return eayefor the next severyears baseon historicperformanof the market.\" Grey’s statements violate the CFA Institute Co anStanr?A.Neither statement violatethe Co anStanr.B.Only statement I violatethe Co anStanr.C.Only statement II violatethe Co anStanr.C is correct.This question involves StanrI(–Misrepresentation. Statement I is a factustatement thscloses to clients anprospects accurate information about the terms of the investment instrument. Statement II, whiguarantees a specific rate of return for a mutufun is opinion statea faan therefore, violates StanrI(C). If statement II were rephraseto inclu a qualifying statement, su \"in my opinion, investors mearn . . . ,\" it woulnot in violation of the Stanr.为什么第一项没有violate？
NO.PZ2016032801000016 问题如下 Grey recommen the purchase of a mutufunthinvests solely in long-term US Treasury bon. He makes the following statements to his clients:I. \"The payment of the bon is guaranteethe US government; therefore, the fault risk of the bon is virtually zero.\"II. \"If you invest in the mutufun you will earn a 10% rate of return eayefor the next severyears baseon historicperformanof the market.\" Grey’s statements violate the CFA Institute Co anStanr? A.Neither statement violatethe Co anStanr. B.Only statement I violatethe Co anStanr. C.Only statement II violatethe Co anStanr. C is correct.This question involves StanrI(–Misrepresentation. Statement I is a factustatement thscloses to clients anprospects accurate information about the terms of the investment instrument. Statement II, whiguarantees a specific rate of return for a mutufun is opinion statea faan therefore, violates StanrI(C). If statement II were rephraseto inclu a qualifying statement, su \"in my opinion, investors mearn . . . ,\" it woulnot in violation of the Stanr. 在题干已经叙述，mutufun投资在美国国债，为什么不可以保证每年10%的收益率。美国国债的收益率不应该是问很稳定的，甚至可以是precate
NO.PZ2016032801000016 强化课讲义提到【如果本身return是可以保证的，也可以guarantee】。 题目中的表述二里面有个baseon historicperformance，这样足以说明return是可以保证的吗？ “本身return是可以保证的”，这句话通常会有哪些表述？ 谢谢老师解答。
老师 如果will earn 的表述不对 那换成什么就可以算是对的
老师 这题没有说10%的收益不是约定好的，咱怎么判断他说的是真是假，只要是题目没给确切的回报率 她说了就都认为是不严谨的对吧；
