The correct answer is option 'D' - Id.

Explanation:
National festivals are celebrated to commemorate significant events or to honor important personalities in a country's history. They hold cultural, historical, and patriotic significance and are celebrated throughout the nation.

a) Independence Days:
Independence Day is a national festival celebrated to mark the day a country gained independence from colonial rule. For example, in India, Independence Day is celebrated on August 15th to commemorate the country's freedom from British rule in 1947.

b) Gandhi Jayanti:
Gandhi Jayanti is another national festival celebrated in India on October 2nd to honor the birth anniversary of Mahatma Gandhi, who played a significant role in India's independence movement. This day is observed to pay homage to his teachings of non-violence, truth, and peace.

c) Republic Day:
Republic Day is a national festival celebrated to honor the day a country's constitution came into effect. In India, Republic Day is celebrated on January 26th to commemorate the adoption of the Indian Constitution in 1950, which established India as a sovereign, socialist, secular, and democratic republic.

d) Id:
Id, also known as Eid, is not a national festival. It is a religious festival celebrated by Muslims worldwide. Id marks the end of Ramadan, the Islamic holy month of fasting. While it is an important festival for the Muslim community, it is not specific to any particular country and is celebrated by Muslims across the globe.

In conclusion, among the given options, Id is not a national festival. National festivals are those that hold significance for an entire nation and are celebrated by people of all religions and communities, whereas Id is a religious festival specific to the Muslim community.