A low trough is indicative of

a serious depression.

the start of a depression.

a growing recession.

the end of a recession.

A low trough is indicative of "a growing recession "

since a trough indicates a general change in the business cycle, which can have varying degrees of importance.

Explanation:

A trough is that the stage of the economy's fluctuation that marks the tip of an amount ... in keeping with the economic condition and are indicative of economic growth. A recession could be an important decline in economic activity that goes on for quite many months ... However, an associate economy that's growing, however, increasing a lot of slowly than its long property rate should still desire a recession or growth recession.

A low trough is indicative of "a growing recession " since a trough indicates a general change in the business cycle, which can have varying degrees of importance.