Final answer:
To change the sentence "India expects everyone to do his duty." into a complex sentence, you can use the option C) "While India expects everyone to do his duty, some may not comply.".
Step-by-step explanation:
A complex sentence contains one main clause and at least one subordinate clause. In order to change the given sentence into a complex sentence, we need to add a subordinate clause.
Out of the given options, option C) "While India expects everyone to do his duty, some may not comply." is a correct complex sentence. It includes the main clause "India expects everyone to do his duty" and the subordinate clause "while some may not comply."