What do the indicators used by economista reveal?

changes in production and demand

changes in employment levels

changes in prices

changes in the health of an economy

Modification in production and demand

Explanation:

Changes occurring in demand of products, goods and services from the side of consumer impacts the production of that particular good.Production and demand of products is indicated by economist as the major factor for economy as they tend to influence supply, manufacturing,prices, employment of workers etc .

Other options are incorrect because employment, health of economy and pricing is the later factors that production and requirement of good will good impact.

i would say b probably

the answer is:

c. economic output