The correct answer is option 'C' which is 1953. Let's discuss why it is the correct answer.

The Context of the Question:
The question is related to the Indian Constitution. The Indian Constitution was adopted on 26th January 1950, but it came into effect on a different date. The question is about that date.

Understanding the Significance of the Date:
The Indian Constitution is a written document that outlines the structure, powers, and functions of the government. It is the supreme law of the land. The Constitution gives rights and freedoms to the citizens of India. It is a symbol of India's sovereignty and democracy. The date on which the Constitution came into effect is an important milestone in India's history.

The Correct Answer:
The Constitution of India came into effect on 26th January 1950. However, some provisions of the Constitution required certain amendments and modifications before they could be implemented. These amendments were made over time, and the Constitution was fully implemented on 26th January 1953, which is the correct answer to the question.

Conclusion:
The Indian Constitution came into effect on 26th January 1950, but it was fully implemented on 26th January 1953. This date is significant in Indian history as it symbolizes India's transition to a sovereign democratic republic.