The correct answer is B. Firdausi.
Firdausi was a Persian poet who is best known for his epic poem Shahnama, which tells the story of the kings of Persia. The Shahnama is considered to be one of the greatest works of Persian literature and is a national epic of Iran.
Utbi was a Persian historian who wrote the book Tarikh-i Yamini, which is a history of the Ghaznavid dynasty. Hasan Nizami was a Persian poet who wrote the book Khamsa, which is a collection of five epic poems. Al-Beruni was a Persian polymath who wrote the book Kitab al-Hind, which is a treatise on India.
Utbi, Hasan Nizami, and Al-Beruni were all important figures in Persian literature and history, but none of them wrote the Shahnama.