Step 1: Understanding the Question
The question asks to identify the Constitutional Amendment Act that added the Fundamental Duties (Article 51A) to the Indian Constitution.
Step 2: Recalling Constitutional History
The Fundamental Duties were not part of the original Constitution.
They were added based on the recommendations of the Swaran Singh Committee.
This was done during the period of the Internal Emergency (1975-77).
The amendment that incorporated these duties was the 42nd Constitutional Amendment Act of 1976.
It added a new part to the Constitution, Part IV-A, which consists of a single article, Article 51A. Initially, there were 10 Fundamental Duties. An eleventh duty was added later by the 86th Amendment Act of 2002.
Step 3: Evaluating the Options
(B) 42nd Constitutional Amendment Act: This is the correct amendment. The 42nd Amendment is also known as the "Mini-Constitution" because of the large number of changes it made.
(D) 44th Constitutional Amendment Act: This amendment was passed in 1978 after the Emergency to reverse many of the changes made by the 42nd Amendment, but it did not remove the Fundamental Duties.
Step 4: Final Answer
The Fundamental Duties were inserted into the Constitution by the 42nd Constitutional Amendment Act, 1976. Therefore, option (B) is the correct answer.