关于这一道大题的问题

NO.PZ202109130200003903问题如下The interpretation of the slope is the: A.change in the annugrowth rate of the money supply per ye B.average annugrowth rate of the money supply after the shift in poli C.fferenin the average annugrowth rate of the money supply from before to after the shift in poli C is correct. Wherethe intercept is the average of the pennt variable when the incator variable is zero (this, before the shift in policy), the slope is the fferenin the meof the pennt variable from before to after the change in policy.题目问的就是这个斜率的理解，在这里斜率就是-5.13912，然后就是变化前后的差，就是他们的均值。是这样吗？总感觉是英语的理解问题。