Which islands make up New Zealand apart from the North and South Islands?

The correct choice encompasses the lesser-known but significant islands of Stewart Island and the Chatham Islands, which are part of New Zealand's territory alongside the well-known North and South Islands. Stewart Island, located south of the South Island, is known for its rich wildlife and natural landscapes, indicating an important aspect of New Zealand's tourism appeal. The Chatham Islands, situated east of the South Island, offer a unique cultural experience and distinct ecosystems, contributing to the diversity of New Zealand's tourism offerings.

While the North and South Islands are the primary focus in most discussions about New Zealand's geography and tourism, they are not part of the question regarding additional islands. Other choices incorrectly suggest islands that are either well-known parts of the main islands or are not recognized as significant separate islands within New Zealand's broader geographical context. For example, Auckland Island is part of the Auckland Islands group but does not represent standalone tourist destinations in the same way as Stewart and Chatham Islands. Thus, this reinforces the accuracy of selecting Stewart Island and the Chatham Islands as the correct response to the question.