问题如下：
Which of the following is a proper description when inflation rate declines and the aggregate price level keeps rising:
选项：
A.deflation.
B.inflation.
C.disinflation.
解释：
C is correct.
Disinflation describes when inflation rate declines but remains positive and the price level increases at a slower speed.
考点：Disinflation
解析：当前物价水平继续上涨，但是增速放缓是指Disinflation，C选项正确。
A选项下，物价水平应该下降，而非上涨。
deflation 通胀率是负数吗？
