In astronomical terms, a cluster ______.

A．The lesser of the two evils is not deflation but inflation.
B．People's income is influenced by both inflation and deflation.
C．Investment is good in times of deflation and unemployment.
D．Private and public investment can cause inflation during deflation.

A．people like private or public investment
B．there is usually full plant capacity
C．creditors stiffer more than other people
D．everyone suffers and no one gains