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Option 1: A. S. Kiran Kumar
Option 2: K. Sivan
Option 3: K. Radhakrishnan
Option 4: S. Somanath
The correct answer is option 4, S. Somanath. The question asks about the tenth Chairman of the Indian Space Research Organization (ISRO), and S. Somanath is the recent appointment to this position.
Option 1, A. S. Kiran Kumar, was the previous Chairman of ISRO until his retirement. He served as the ninth Chairman of ISRO from 2015 to 2018.
Option 2, K. Sivan, is a renowned Indian space scientist who has served as the Chairman of ISRO from 2018 to 2021. However, he is not the tenth Chairman as the question asks.
Option 3, K. Radhakrishnan, served as the Chairman of ISRO from 2009 to 2014. Again, he is not the tenth Chairman.
Therefore, the correct answer is option 4, S. Somanath, as he is the recent appointment to the position of Chairman of ISRO.