在分布滞后模型Y<sub>t</sub>=α+β<sub>0</sub>X<sub>t</sub>+β<sub>1</sub>X<sub>t-1</sub>+β<sub>2</sub>X<sub>t-2</sub>+…β<sub>k</sub>X<sub>t-k</sub>+μ<sub>t</sub>中,动态乘数为()。<br /> <img src="https://nimg.ppkao.com/2019-04/wangxuan/2019041413585954163.jpg?sign=ac5a9fa4e918f9ee2522131d0b4b9d36&t=62d7d475" />
A、A
B、B
C、C
D、D