Option a is the correct answer. Gautama Buddha is known as the "Light of Asia" because of his teachings, which have brought hope and enlightenment to millions of people around the world. He is also known for his compassion and his commitment to helping others. The term "Light of Asia" was first used by Sir Edwin Arnold in his poem "The Light of Asia", which was published in 1879. The poem tells the story of the Buddha's life and teachings.