The correct answer is: A. The four Vedas.
The Brahmanas, the Arayakas and the Upanishads are attached to one or the other of the four Vedas. The Vedas are the oldest scriptures of Hinduism and are considered to be the most sacred texts. They are divided into four parts: the Rig Veda, the Yajur Veda, the Sama Veda, and the Atharva Veda.
The Brahmanas are the first layer of Vedic literature. They are prose texts that explain the rituals and ceremonies of the Vedas. The Arayakas are the second layer of Vedic literature. They are prose texts that discuss the philosophical and metaphysical aspects of the Vedas. The Upanishads are the third layer of Vedic literature. They are philosophical texts that discuss the nature of reality and the goal of human life.
The Brahmanas, the Arayakas and the Upanishads are all considered to be sacred texts by Hindus. They are studied and revered by Hindus all over the world.
The Ramayana and the Mahabharata are two of the most important epics in Hinduism. They are both long stories that tell the tales of two great heroes, Rama and Arjuna, respectively. The Purans are a collection of texts that contain stories about the gods and goddesses of Hinduism. They are also considered to be sacred texts by Hindus.
However, the Brahmanas, the Arayakas and the Upanishads are not attached to the Ramayana, the Mahabharata or the Purans. They are attached to the Vedas, which are the oldest and most sacred texts of Hinduism.