The D.C. Wadhwa vs. State of Bihar case in the Supreme Court is related to the governor`s power to repromulgate ordinances. This falls under option 1. It addressed the issue of repeated repromulgation of ordinances by the Bihar state governor, and it was ruled that the practice of frequently using ordinances when the legislative assembly was not in session was not constitutional.

Option 2 refers to the governor`s power to appoint a chief minister. This power doesn`t pertain to the D.C. Wadhwa case since it didn`t involve the appointment of a chief minister.

Option 3 about the governor`s power to grant pardon also doesn`t apply to this case. The case was about governance norms and constitutionality, not about any pardons or reprieves.

Option 4 pertains to revising the emoluments and allowances of MLAs. This too was not the main topic in the D.C Wadhwa vs. State of Bihar case. The issue in the case was about the frequent repromulgation of ordinances and not about MLA emoluments or allowances.