c) Use the diagram to talk about the UK.

Talking about the UK using the diagram:

The diagram illustrates the United Kingdom as a larger entity composed of its constituent countries: England, Scotland, Wales, and Northern Ireland. Each of these countries has its own capital city. For example, London is the capital of England, and it is also the capital of the entire United Kingdom. Edinburgh is the capital of Scotland, Cardiff is the capital of Wales, and Belfast is the capital of Northern Ireland. The diagram serves as a visual organizer to understand the hierarchical structure of the UK and its main components.