The error is in option C. The correct sentence should be:

C. is now free from selfish interests.

Explanation for each option:

☀ A: There is no error in option A. The sentence is grammatically correct: "The Indian radio."

☀ B: There is no error in option B. The sentence is grammatically correct: "which was previously controlled by the British rulers."

☀ C: The error is in option C. The word order is incorrect. The correct phrase is "is now free from selfish interests." The word "now" should come before "free" to indicate the present state of being free from selfish interests.

☀ D: The statement "No error" is incorrect because the error is in option C, as explained above.