The correct answer is option 3, the United States. The Indian Constitution borrowed the feature of having a written constitution from the United States. A written constitution is a document that outlines the fundamental principles and rules of a country, serving as the supreme law. It provides the framework for the organization and functions of the government and enshrines the rights and freedoms of the citizens. The United States is known for having one of the oldest written constitutions in the world, which heavily influenced the framers of the Indian Constitution. It is important to note that while India borrowed the concept of a written constitution from the United States, it also adapted and modified it to suit the unique needs and circumstances of the country.