你好，讲义里是 如果lnX是normal，那么X是lognormal。答案C因果关系说反了为什么还对呢？

问题如下：

Which of the following statements best characterizes the relationship between the normal and lognormal distributions?

选项：

A.

The lognormal distribution is the logarithm of the normal distribution.

B.

If the natural log of the random variable X is lognormally distributed, then X is normally distributed.

C.

If X is lognormally distributed, then the natural log of X is normally distributed.

D.

The two distributions have nothing to do with one another.

解释：

X is said to be lognormally distributed if its logarithm Y = ln(X) is normally distributed.