The correct option is 1 and 3 only. Mahatma Gandhi played a significant role in advocating for the rights of indentured laborers and highlighted the exploitative nature of their conditions, contributing indirectly to the eventual decline of the system. Statement 3 is accurate as the Indian National Congress was declared illegal in response to the Salt March and subsequent civil disobedience, which signified a critical moment in the Indian independence movement. However, statement 2 is incorrect; Gandhi did support the recruitment resolution during the War Conference, under the condition that it would lead to self-governance for India post-war. This context is crucial for understanding Gandhi's strategies, negotiations, and the larger dynamics of colonial rule during the freedom struggle.