Final answer:
New Zealand and Australia still maintain ties to Britain, recognizing the British monarch as their ceremonial head of state, while the USA and Tonga do not.
Step-by-step explanation:
The countries that still maintain ties to Britain (England) as part of the Commonwealth realm are C) New Zealand and D) Australia. These countries recognize the British monarch as their ceremonial head of state but operate with independent governments. The United States of America (USA) declared independence from Britain in 1776 and has no such ties, and Tonga, while it is a member of the Commonwealth of Nations, is a fully independent country with its own monarchy.