问题如下图：
选项：
A. 
B. 
C. 
解释：
老师，请问real/nominal rate和real/nominal risk free rate的区别呢？
NO.PZ2017092702000002 问题如下 Whiof the following risk premiums is most relevant in explaining the fferenin yiel between 30-yebon issuethe US Treasury an30-yebon issuea small private issuer? A.Inflation B.Maturity C.Liquity C is correct. US Treasury bon are highly liqui wherethe bon of small issuers tra infrequently anthe interest rate inclus a liquity premium. This liquity premium reflects the relatively high costs (inclung the impaon price) of selling a position.美国国债具有高流动性，而小型的债券交易很少。而利率包含流动性溢价。 这种流动性溢价会反映出相对较高的成本（包括对价格的影响）。 这道题如果答案中还有一个 fault，是不是也可以选择？
NO.PZ2017092702000002问题如下Whiof the following risk premiums is most relevant in explaining the fferenin yiel between 30-yebon issuethe US Treasury an30-yebon issuea small private issuer? A.InflationB.MaturityC.Liquity C is correct. US Treasury bon are highly liqui wherethe bon of small issuers tra infrequently anthe interest rate inclus a liquity premium. This liquity premium reflects the relatively high costs (inclung the impaon price) of selling a position.美国国债具有高流动性，而小型的债券交易很少。而利率包含流动性溢价。 这种流动性溢价会反映出相对较高的成本（包括对价格的影响）。 maturity risk 是什么
NO.PZ2017092702000002 问题如下 Whiof the following risk premiums is most relevant in explaining the fferenin yiel between 30-yebon issuethe US Treasury an30-yebon issuea small private issuer? A.Inflation B.Maturity C.Liquity C is correct. US Treasury bon are highly liqui wherethe bon of small issuers tra infrequently anthe interest rate inclus a liquity premium. This liquity premium reflects the relatively high costs (inclung the impaon price) of selling a position.美国国债具有高流动性，而小型的债券交易很少。而利率包含流动性溢价。 这种流动性溢价会反映出相对较高的成本（包括对价格的影响）。 30年的国债和公司债相比是不是也有期限风险，即B，即拖的越长，不缺定的风险越高。夜长梦多。当然也是有流动性风险的，但B和C如何区别呢
NO.PZ2017092702000002问题如下Whiof the following risk premiums is most relevant in explaining the fferenin yiel between 30-yebon issuethe US Treasury an30-yebon issuea small private issuer? A.InflationB.MaturityC.Liquity C is correct. US Treasury bon are highly liqui wherethe bon of small issuers tra infrequently anthe interest rate inclus a liquity premium. This liquity premium reflects the relatively high costs (inclung the impaon price) of selling a position.美国国债具有高流动性，而小型的债券交易很少。而利率包含流动性溢价。 这种流动性溢价会反映出相对较高的成本（包括对价格的影响）。 为什么不选inflation risk
NO.PZ2017092702000002 问题如下 Whiof the following risk premiums is most relevant in explaining the fferenin yiel between 30-yebon issuethe US Treasury an30-yebon issuea small private issuer? A.Inflation B.Maturity C.Liquity C is correct. US Treasury bon are highly liqui wherethe bon of small issuers tra infrequently anthe interest rate inclus a liquity premium. This liquity premium reflects the relatively high costs (inclung the impaon price) of selling a position.美国国债具有高流动性，而小型的债券交易很少。而利率包含流动性溢价。 这种流动性溢价会反映出相对较高的成本（包括对价格的影响）。 Maturity risk premiums 什么中文意思？同时可以举例说明下该种风险吗
