The correct answer is: A. Nahar Singh
Nahar Singh was a Jat ruler of Ballabhgarh in the 18th century. He was known for his bravery and his resistance to the Mughal Empire. He was killed in battle in 1781.
Samand Khan was a Mughal general who fought against Nahar Singh. He was eventually defeated and killed by Nahar Singh.
Fateh Singh was a Jat ruler of Bharatpur in the 18th century. He was a contemporary of Nahar Singh and they were both allies against the Mughals.
Chhotu Ram was a Jat leader and social reformer in the 19th century. He is not known as the ‘Lion of Ballabhgarh’.