Which country has the Union Jack in its flag?

The story behind the answer

New Zealand is correct because its national flag features the Union Jack in the top-left corner, reflecting its historical ties to the United Kingdom as a former British colony. The flag also shows four red stars with white borders, representing the Southern Cross constellation—signifying its location in the Southern Hemisphere.

Helpful context: Several countries once under British rule include the Union Jack in their flags, but among these options only New Zealand does. Canada’s flag has a red maple leaf; South Africa’s has a distinctive multicolored “Y”; Hong Kong’s features a white bauhinia flower. To remember the difference from Australia’s similar flag: New Zealand’s stars are red (with four points shown), and it lacks Australia’s large Commonwealth Star.