Economic Activities are best defined as those activities that :

Contribute to Gross National Product

The correct answer is option (2) : Contribute to Gross National Product

Economic activities are fundamentally related to the generation of wealth and the production of goods and services that contribute to the economic well-being of a society, which is reflected in indicators like GNP or GDP. Economic activities are best defined as those activities that contribute to the Gross National Product (GNP) or Gross Domestic Product (GDP). GNP or GDP measures the total value of goods and services produced within a country's borders in a specific time period. Economic activities involve the production, distribution, and consumption of goods and services that contribute to the overall economic output of a nation.

Options (1), (3), and (4) do not encompass the broad scope of economic activities.