"Sedition has become my religion" was the famous statement given by Gandhiji at the time of

1. A

   the Champaran Satyagraha

   Champaran. Too early; 1917 indigo, not this quote-event.

2. B

   publicly violating Salt Law at Dandi

   Publicly violating the Salt Law at Dandi. ‘Sedition has become my religion’ is keyed to that Civil Disobedience moment.

3. C

   attending the Second Round Table Conference in London

   Second Round Table Conference. 1931 London; not this statement.

4. D

   the launch of the Quit India Movement

   Quit India. 1942; later.

Summary. Official Set A key is (b). Gandhi’s line that sedition had become his religion is placed with the Salt Satyagraha / Dandi public breach of the salt law (1930), not Champaran, the RTC, or Quit India.