The rules made for the Buddhist Sangha (order of monks and nuns) are contained in the:

The rules and regulations for the Buddhist Sangha (the community of monks and nuns) are contained in the Vinaya Pitaka.

About the Vinaya Pitaka:

• "Vinaya" means "discipline".
• It contains the rules of conduct for monks and nuns, called the "Patimokkha" (227 rules for monks in the Theravada tradition, and more for nuns).
• It also explains the circumstances in which each rule was made by the Buddha, through stories.
• It describes the procedures for ordination (admission to the Sangha), the holding of meetings, the rainy-season retreat, and the settlement of disputes.
• According to tradition, it was recited by the monk Upali at the first Buddhist council, held soon after the Buddha's death.

Rules of the Sangha (NCERT):

• All persons could join the Sangha, but children had to have their parents' permission, and slaves their masters' permission.
• Those who worked for the king had to take his permission, and debtors had to get the permission of their creditors.
• Women needed the permission of their husbands.
• Monks and nuns lived simple lives; they begged for food (and were called "bhikkhus" and "bhikkhunis").
• The Sangha was governed by discussion and decisions were taken by consensus or by vote.

The Tipitaka (Three Baskets):

• The Buddhist canon in Pali is called the "Tipitaka" (Tripitaka in Sanskrit).
• It has three parts: the Vinaya Pitaka (rules), the Sutta Pitaka (discourses of the Buddha) and the Abhidhamma Pitaka (philosophical analysis).
• They were transmitted orally for several centuries and written down in Sri Lanka in the 1st century BCE.

Why not the other options?

• ✗The Sutta Pitaka contains the Buddha's discourses.
• ✗The Abhidhamma Pitaka contains philosophical analysis.
• ✗The Jatakas are stories of the Buddha's previous births.