Correct Answer:
A. Rumi
The Mathnawi-e-Ma'navi, commonly known as the Mathnawi, is the monumental masterpiece of Jalal ad-Din Muhammad Rumi. This six-volume epic poem is a cornerstone of Persian literature and Sufi mysticism, renowned for its profound spiritual insights, parables, and lyrical beauty. It explores themes of divine love, separation, and union with God. Saadi is famous for his 'Gulistan' and 'Bustan'. Anwari was a celebrated panegyrist. Shams Tabrizi was Rumi's spiritual mentor, not the author of the Mathnawi, though his influence on Rumi's work was immense.