Explanation

Gilgit Baltistan is the correct answer because it celebrated its 72nd Independence Day on November 1st, 2019. AJK is incorrect as it did not celebrate its 72nd Independence Day on that date. Bahawalpur State is incorrect because it was a princely state and not the subject of this specific anniversary. Khairpur State is incorrect because it was also a princely state and not related to this event.