Correct Answer:
C. Sanai Ghaznavi
The Mathnawi Hadiqat-ul-Haqiqat, meaning 'The Garden of Truth', is a foundational work in Persian Sufi literature. It was composed by Sanai Ghaznavi (Abu'l-Majd Majdud ibn Adam Sanai), an influential 12th-century Persian poet. This epic poem is considered one of the earliest and most significant mystical mathnawis, deeply impacting subsequent Sufi poets like Rumi. Farrukhi Sistani and Amir Moazzi were renowned panegyric poets, while Abu Shakoor Balkhi is known for his 'Afrin-nama', none of whom authored this specific mystical work.