Which of the following is correctly spelt?

Correct option is C

Option (c) is the correctly spelt word.
Correct spelling is: “Reciprocity” – It means the practice of exchanging things with others for mutual benefit, especially privileges granted by one country or organization to another. (लेन-देन या पारस्परिकता)
Example: A sense of reciprocity between teacher and student creates a healthy learning environment.