Option 1, Directive principles of the state policy, refers to the guidelines or principles given to the government to govern the country. These principles include promoting the welfare of the people, ensuring justice and equality, and eradicating poverty and inequality.

Option 2, Fundamental duties, refers to the moral obligations of every citizen to respect the ideals and institutions of the country. These duties were added to the Constitution by the 42nd Amendment Act in 1976. They include duties such as respecting the national flag and the national anthem, safeguarding public property, and promoting harmony among all sections of society.

Option 3, Fundamental rights, refers to the basic rights guaranteed to every citizen of India. These rights include the right to equality, freedom of speech and expression, and freedom of religion.

Option 4, Preamble, is the introductory statement of the Constitution that outlines the aims and objectives of the Constitution. It highlights the ideals and aspirations of the people of India. The provided phrase, "To cherish and follow the noble ideas which inspired our national struggle for freedom," is actually a part of the Preamble.

Therefore, the correct answer is option 2, Fundamental duties.