Answer:
The word underlined in the sentence is best defined as activity.
"Each economic activity play the vital role in the nation's economy".
Explanation:
An economic sector is one in which a good is produced and exchanged for another good or for money, generating the flow and distribution of wealth in a given population.
Economic sectors involve each of the activities that generate goods and services to meet the needs of a population and generate wealth, being the main activities -or sectors- of the economy:
- Farming / fishing.
- Agriculture.
- Industry and commerce.
- Communications.
- Diverse services provided by qualified or unqualified personnel.
Each one of the economic activities that are carried out in a country contribute to cover the requirements of the population, at the same time that they constitute the economy of this country.
