Final answer:
The hypothetical answer to Rushdie's question about what holds India together is not provided without the specific source material involving Rushdie and Chatterjee.
Step-by-step explanation:
The question references a dialogue between Salman Rushdie and another individual identified only as Chatterjee. In the given context, the hypothetical answer to Rushdie's question about the 'glue' that holds India together would be part of a literary or social studies discussion. However, the question doesn't provide the source material required to know Chatterjee's reply definitively.
As for the context provided, the rulers of the Delhi Sultanate were followers of Islam, which is not one of the answer choices provided in the question. Also, the hymns brought to India by the Aryans are known as the Vedas, while India's political culture as outlined by its constitution emphasizes democracy, the rule of law, and linguistic as well as religious freedoms.
Without the specific source for the direct interaction between Rushdie and Chatterjee, providing a correct answer would simply be speculation, hence I'm unable to provide a definitive choice.