问题如下图：bsm模型需要满足无风险利率和波动稳定？价格无上限三个条件？
选项：
A. 
B. 
C. 
D. 
解释：
have upper priboun have constant privolatility. are not pricearbitrage. The Black-Scholes-Merton mol cannot usefor the valuation of fixeincome securities because it makes the following assumptions, whiare not reasonable for valuing fixe income securities: l There is no upper priboun l The risk-free rate is constant. l Bonvolatility is constant. b是什么意思呢为什么不选a
为什么c不对呢
