What does the fact that each Australian colony had its own constitution before 1901 show about the period before Federation?

What does the fact that each Australian colony had its own constitution before 1901 show about the period before Federation?

• AThe colonies had separate constitutional arrangements.Correct
• BThe colonies already operated under one Australian national constitution.
• CThe colonies had no legal or political structures.
• DThe colonies were all governed by a single state parliament.

Because each colony had its own constitution before 1901, the colonies had separate constitutional arrangements before Federation.