Assertion (A) correctly identifies the period 1920-22 (the height of the Non-Co-operation Movement) as a time of significant working-class activity and the formation of their own organizations. Reason (R) provides a specific example of this by stating that the All India Trade Union Congress (AITUC) was formed in 1920 and that Lokamanya Tilak was instrumental in its formation. Both statements are historically accurate. The question asks only if the statements are correct, not about the relationship between them.