The correct answer is option 3 - Both I and 2.

Statement 1 is correct. British colonialism did indeed continue to grow steadily in the 18th and 19th centuries. During this time period, the British Empire expanded its control and influence in many regions, including India, Africa, Southeast Asia, and the Caribbean.

Statement 2 is also correct. Raw cotton for the textile industry in Britain during the industrial revolution needed to be imported. The industrial revolution in Britain brought about a significant increase in the demand for cotton for the textile industry. However, Britain did not have sufficient domestic sources of cotton and therefore needed to import it from countries like India and the United States.

Therefore, both statements 1 and 2 are correct. They provide accurate information about British colonialism and the need to import raw cotton for the textile industry during the industrial revolution. There is no need for an alert or correction in this case.