The Bharatiya Janata Party (BJP) led a coalition of political parties called the National Democratic Alliance (NDA) in 2019, which was also the alliance during the 2014 elections. This coalition has been the main opposition to the United Progressive Alliance (UPA), led by the Congress Party, and has played a major role in Indian politics, particularly under the leadership of Narendra Modi.
Thus, the correct answer is (C) National Democratic Alliance.