Explanation:

- Option 1: Revaluation

Revaluation is an increase in the value of a country’s currency relative to foreign currencies. It is the opposite of devaluation and usually happens in a fixed exchange rate system.

- Option 2: Devaluation

Devaluation means a deliberate decrease in the value of a country’s currency against foreign currencies. This makes foreign goods (commodities) costlier for domestic consumers and can affect foreign trade.

- Option 3: Deflation

Deflation refers to a general decrease in the prices of goods and services in an economy, not specifically related to currency value or foreign commodities.

- Option 4: All of these

This is incorrect because only devaluation fits the definition.

Correct Answer:

Option 2 - Devaluation