Option A is correct - the Swarajists were called 'pro-changers' because they wanted to change Congress tactics by entering councils. Option B is correct - the Swaraj Party was indeed formed in January 1923. Option C is correct in substance - the Swarajists wanted to change the methodology from non-cooperation to council entry. Since all statements A, B, and C are factually correct, Option D (None of these) is logically correct as there is no incorrect statement among A-C.