Put the main sources of revenue of the Central Government in ascending order ofimportance: 1. Income tax 2. Corporation tax 3. Customs 4. Excise duties

• A. 1, 2, 3, 4
• B. 3, 2, 4, 1
• C. 4, 3, 1, 2
• D. 4, 3, 2, 1