The correct answer is C. Zend Avesta.
The Zend Avesta is the holy book of Zoroastrianism, the oldest monotheistic religion in the world. It is a collection of sacred texts that were written over a period of several centuries, from the 12th to the 6th centuries BCE. The Zend Avesta is divided into two parts: the Yasna, which is a collection of hymns and prayers, and the Vendidad, which is a collection of laws and regulations.
The Torah is the first five books of the Hebrew Bible, and is the most important religious text of Judaism. The Bible is the sacred text of Christianity, and is composed of the Old Testament and the New Testament. The Gita is a Hindu scripture that is part of the Mahabharata, an epic poem.
The Zend Avesta is the most important religious text of Zoroastrianism. It is a collection of sacred texts that were written over a period of several centuries, from the 12th to the 6th centuries BCE. The Zend Avesta is divided into two parts: the Yasna, which is a collection of hymns and prayers, and the Vendidad, which is a collection of laws and regulations. The Zend Avesta is a valuable source of information about Zoroastrianism, and it provides insights into the history, culture, and religion of ancient Iran.