Correct option is D
The correct answer is option (d): Currency
Explanation:
Dollar, Rupee, Yen, and Taka are all names of currencies used by different countries:
Dollar: Used in countries like the USA, Canada, and Australia.
Rupee: Used in India, Pakistan, Sri Lanka, Nepal, etc.
Yen: Used in Japan.
Taka: Used in Bangladesh.
While the terms Wealth, Finance, and Economy are related to money or financial matters, they are broader and do not specifically describe these units.
Currency is the most specific term, as it refers to the system of money in general use in a particular country or region. Therefore, these units are best described as currencies.