Answer: (D) Australia
Australia is an example of a 'coming together' federation, where independent states voluntarily united to form a federation, as also seen in the USA.
The textbook distinguishes two types of federations: 'coming together' (independent states join voluntarily — USA, Australia, Switzerland) and 'holding together' (a large country divides power among regions — India, Belgium, Spain). Examiners expect you to recall Australia/USA as examples of 'coming together' federations. India, Belgium, and Spain are all 'holding together' federations, making (D) the correct choice.