Final answer:
The Bhagavad Gita is the most important text for the emergence of Bhakti Hinduism, providing essential teachings on devotion and duty.
Step-by-step explanation:
The text most important for the emergence of Bhakti (devotional) Hinduism is C. Bhagavad Gita. The Bhagavad Gita, often considered a summary of the spiritual teachings of the Vedas, is a dialogue between Prince Arjuna and the god Krishna, providing profound insights into duty, righteousness, and devotion. As a small but critical part of the Mahābhārata, it has had a significant influence on the development and expression of Bhakti traditions within Hinduism, emphasizing a personal, intimate relationship with the divine.