To answer this question, you need to know the holy book of the Jorastrains.
Option A) Tripitakas - This option is incorrect. Tripitakas are the sacred scriptures of Buddhism, not Jorastrains.
Option B) Tirthankaras - This option is incorrect. Tirthankaras refer to the enlightened beings in Jainism, not Jorastrains.
Option C) Zenda-Avestha - This option is correct. Zenda-Avestha, also known as the Avesta, is the holy book of Jorastrains. It contains the religious texts and teachings of Zoroastrianism.
Option D) Khuran - This option is incorrect. The Quran, also spelled as Quran or Koran, is the holy book of Islam, not Jorastrains.
The correct answer is C) Zenda-Avestha. It is the holy book of Jorastrains, also known as Zoroastrians.