A business cycle can indicate that an economy is in a recession if

The correct response will be "general decline in economic activity".

Explanation:

i beleive a. is the only possible answer

consider an orange peel: if you want to try and lay it flat, you have to stretch it, we know exactly how things are being stretched or squashed at any given point. we have many different map projections because each has different patterns of some projections can even preserve certain features of the earth without