NO.PZ2018062016000085
问题如下：
To calculate possible yield, a multivariate distribution is most likely to be applied in:
选项：
A. A swap
B. A portfolio of clean-energy companies' stocks
C. A T-bill
解释：
B is correct. Several random variables are included in a multivariate distribution, every variable is related with each other. A portfolio of clean-energy companies' stocks contains a group of relevant assets，thus the multivariate distribution should be applied.
ABC三个选项是什么意思呢
