What government planned for different economic activities is an application of which of the following?

Ex-ante.

The correct answer is Option (4) → Ex-ante.

When the government plans for different economic activities in advance — such as investment, production, or expenditure — it represents ex-ante analysis. The term ex-ante means “before the event”, referring to planned or expected values of economic variables. In contrast, ex-post refers to actual outcomes after the event has occurred.