Detailed explanation and options for the selected question.
The Indian National Congress is the longest-serving political party in India, having been in power for a large part of the country’s independent history. Option "Bharatiya Janata Party" is incorrect as it came to prominence much later. Option "Communist Party of India" has been an important political force but has not served as long as Congress. Option "Aam Aadmi Party" is a newer political party and has not had a long tenure.