A.I. Explanation:

Option 1: "Sydney is the capital of Australia."

Explanation: This option is incorrect because the text explicitly states that Canberra is the capital of Australia, not Sydney. The statement contradicts the main idea presented in the text.

Option 2: "Canberra was created as the capital due to rivalry between Sydney and Melbourne."

Explanation: This option is correct as the text mentions that a new city, Canberra, was created to be the capital due to the rivalry between Sydney and Melbourne. This directly supports the statement, aligning with the text's main idea.

Option 3: "Canberra is one of several planned capital cities in the world."

Explanation: This option is incorrect because the text specifies that Canberra is one of only two completely planned capitals in the world, not 'several.' This makes the statement misleading and not fully accurate.

Option 4: "The National Botanic Gardens in Canberra feature a collection of Australia’s unique plants and trees."

Explanation: This option is correct as the text describes the National Botanic Gardens in Canberra as having a marvellous collection of Australia’s weird and wonderful trees and plants, which supports the statement about unique plants.

Option 5: "Canberra is located far from both Sydney and Melbourne."

Explanation: This option is incorrect because the text states that Canberra is located at a roughly equal distance from both Sydney and Melbourne, which means it is not far from them. This contradicts the statement.