- Article 249 allows Parliament to legislate on a State List subject if Rajya Sabha passes a resolution in national interest. - Other circumstances allowing Parliament to legislate on State List subjects include during a National Emergency (Art. 250), with the consent of states (Art. 252), for implementing international treaties (Art. 253), and during President's Rule (Art. 356/357). - Option B correctly identifies one of the constitutional provisions enabling this. Options A, C, and D are not generally valid or complete descriptions of the process.