Trade balance

Which of the following statements are correct?

1. British 'trade surplus' with India in the nineteenth century meant that the value of British exports to India was much higher than the value of British imports from India
2. India played a crucial role in the late-nineteenth-century world economy by helping Britain balance its deficits
3. Britain grew opium in India and exported it to China and, therefore, for a while after the 1820s, opium became India's single largest export
4. The nineteenth century saw export of Indian raw materials decline, and that of manufactured goods increase. Select the answer

using the code given below:

Consider the following statements : The effect of devaluation of a currency is that it necessarily

1. improves the competitiveness of the domestic exports in the foreign markets
2. increases the foreign value of domestic currency
3. improves the trade balance

Which of the above statements is/are correct?