hello shiv shukla,
i think there is no set c answer key for set c is available.you can check out the set a and set b answer key from this given link.
https://school.careers360.com/articles/nso-answer-key
I Hope this information will be useful to you.
if you need additional information,let us know to help you.
Thank you!!!:)
Answer Key | Eligibility | Application | Exam Pattern | Result | Cutoff | Admit Card
Eligibility | Application | Admit Card | Result | Preparation Tips | Exam Pattern | Selection Process
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile