Final answer:
Krishna talks Arjuna into performing his duty as a warrior according to the Bhagavad Gita, convincing him on the battlefield to fight without attachment to the outcomes of the war.
Step-by-step explanation:
In the context of the Indian epic Mahabharata, Krishna is the deity who convinces Arjuna to perform his duty as a warrior. During the discourse known as the Bhagavad Gita, which is a part of the Mahabharata, Krishna acts as Arjuna's charioteer and imparts spiritual wisdom, enlightening him on his dharma, or duty, and the nature of life, duty, and righteousness.
The exchange between Krishna and Arjuna takes place on the battlefield just before the commencement of a great war, with Arjuna experiencing doubts about fighting. It is here that Krishna explains to Arjuna the importance of fulfilling his role as a Kshatriya, or warrior, and guides him to act according to his warrior code without attachment to the results of his actions.
Thus, the correct answer to the student's question is option b) Krishna, who talks Arjuna into performing his duty as a warrior.