问题如下图：
选项：
A. 
B. 
C. 
解释：在强势有效中，被动和主动投资收益是不是一样的？
NO.PZ2015122802000085问题如下If a market is semi-strong-form efficient, the risk-austereturns of a passively manageportfolio relative to actively manageportfolio are most likely:A.lower.B.higher.C.the same. is correct.In a semi-strong-form efficient market, passive portfolio strategies shouloutperform active portfolio strategies on a risk-austebasis.考点Efficient CapitMarket AnIts Forms在半强有效市场中，active的策略也无法获得超额收益，但它比passive投资策略成本还高。所以passive投资策略会优于active投资策略。 risk-austereturn 也需要剔除管理成本？
NO.PZ2015122802000085 问题如下 If a market is semi-strong-form efficient, the risk-austereturns of a passively manageportfolio relative to actively manageportfolio are most likely: A.lower. B.higher. C.the same. is correct.In a semi-strong-form efficient market, passive portfolio strategies shouloutperform active portfolio strategies on a risk-austebasis.考点Efficient CapitMarket AnIts Forms在半强有效市场中，active的策略也无法获得超额收益，但它比passive投资策略成本还高。所以passive投资策略会优于active投资策略。 题干If a market is semi-strong-form efficient, the risk-austereturns of a passively manageportfolio relative to actively manageportfolio are most likely:以下理解正确吗？如果是半强有效的市场，（又因为证券法规定不可使用private info） 因此，建议使用被动投资的方法。因为主动投资不能获取超额收益，α=0。被动投资不能获取超额收益，α=0。但由于主动投资产生的交易成本比被动投资高，所以，被动投资获得的收益比主动投资要高。
NO.PZ2015122802000085 问题如下 If a market is semi-strong-form efficient, the risk-austereturns of a passively manageportfolio relative to actively manageportfolio are most likely: A.lower. B.higher. C.the same. is correct.In a semi-strong-form efficient market, passive portfolio strategies shouloutperform active portfolio strategies on a risk-austebasis.考点Efficient CapitMarket AnIts Forms在半强有效市场中，active的策略也无法获得超额收益，但它比passive投资策略成本还高。所以passive投资策略会优于active投资策略。 在什么市场中，被动和主动投资收益是一样的？
risk-austereturns是啥？
