Step 1: Understanding the Concept:
"The Light of Asia" is a specific literary title that became synonymous with the Buddha in the West during the late 19th century.
Step 2: Detailed Explanation:
Sir Edwin Arnold wrote the epic poem The Light of Asia (or The Great Renunciation) in 1879.
The book narrates the life of Prince Gautama and his journey to enlightenment. It was highly influential in bringing Buddhist philosophy to the English-speaking world.
While the others were great scholars (Max Muller, Rhys Davids) or poets (Tagore), only Arnold is uniquely identified with this specific title.
Step 3: Final Answer:
Edwin Arnold is known as the author of 'The Light of Asia'.