Which event marked the introduction of unrestricted women's suffrage in New Zealand?

The introduction of unrestricted women's suffrage in New Zealand is marked by the establishment of full political equality for women. This milestone occurred in 1893 when New Zealand became the first self-governing country in the world to grant women the right to vote in parliamentary elections. This significant development was a culmination of various social movements advocating for women’s rights and equality, demonstrating a commitment to democratic principles that recognized women's participation in the political process.

The other options do not directly relate to women's suffrage or the political advancements in New Zealand during that period, making the establishment of full political equality for women the correct event associated with this achievement.