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: