The terms of trade of a country is defined as

• A.\(\frac{\text{Index of import prices}}{\text{Index of export prices}}\) x 100
• B.\(\frac{\text{Index of exportable}}{\text{Index of importable}}\) x 100
• C.\(\frac{\text{Index of visible imports}}{\text{Index of visible exports}}\) x 100
• D.\(\frac{\text{Index of export prices}}{\text{Index of import prices}}\) x 100
• E.