The correct answer is (b) Kailash Satyarthi.
Kailash Satyarthi is an Indian social activist who has campaigned against child labour. He is the founder of Bachpan Bachao Andolan (BBA), an organization that works to rescue children from forced labor and rehabilitate them. Satyarthi has been awarded numerous awards for his work, including the Nobel Peace Prize in 2014.
Omprakash Pandey is an Indian politician who has served as the Chief Minister of Uttar Pradesh. He is a member of the Bharatiya Janata Party (BJP).
Mohanlal is an Indian actor who has starred in over 300 films. He is one of the most popular actors in India.
Nagendra Singh was an Indian jurist who served as the Chief Justice of India. He was also a judge of the International Court of Justice.
Kailash Satyarthi is the only person among the given options who has been awarded the Nobel Peace Prize for the abolition of child labor.