The correct option is option 4: 3 and 4.

Option 1 states that Fundamental Duties can be enforced through writ jurisdiction. This statement is incorrect. Fundamental Duties are not enforceable in a court of law, hence they cannot be enforced through writ jurisdiction.

Option 2 states that Fundamental Duties have formed a part of the Constitution since its adoption. This statement is correct. Fundamental Duties were added to the Constitution by the 42nd Amendment Act in 1976.

Option 3 states that Fundamental Duties became a part of the Constitution in accordance with the recommendations of the Swaran Singh Committee. This statement is incorrect. While the Swaran Singh Committee did recommend the inclusion of Fundamental Duties, they were actually added to the Constitution through an amendment and not solely based on the committee`s recommendations.

Option 4 states that Fundamental Duties are applicable only to the citizens of India. This statement is correct. Fundamental Duties are specific obligations and responsibilities that only apply to the citizens of India, and not to foreigners or non-citizens.