The function of the noun clause <em>that you are ready to graduate </em>is that of the subject of this sentence. If you are unsure how to solve this, just change the whole noun clause with a pronoun, and it will become much easier: That is very clear to me. What is very clear to me? That. Or use that question technique with this example: What is very clear to me? That you are ready to graduate.
The best statement that explains how the Ramayana describes the Hindu belief in the importance of duty and honor is the Rama leaves the palace, accompanied by his wife.The correct answer is A.