问题如下：
Analysts make two conclusions about macroeconomic model and fundamental model:
Conclusion one: the factors in macroeconomic model are based on surprises in economic variables and the factors in fundamental model are based on P/E or size.
Conclusion two: the factor sensitivities are determined first in macroeconomic model, the factor sensitivities are determined last in fundamental model.
Which of the following statement is most likely correct?
选项：
A.Both conclusion one and two are correct.
B.Only conclusion two is correct.
C.Only conclusion one is correct.
解释：
C is correct.
考点：macroeconomic model and fundamental model 的变量辨析
解析：结论一说的是宏观经济模型里的factor是surprise,基本面模型里的factor是和公司相关的指标，比如标准化之后的p/e
结论二的说法是错误的，正确的说法是，在宏观经济模型里，F是真实的数据，b是回归求出的，所以首先确定的是F。在基本面模型里，b是真实的数据，F是回归出来的，所以首先确定的是b。
which means b is factor sensitivity？
