The correct answer is (b), Najib Khan.
Najib Khan was a Rohilla chief who was the confidant of Ahmad Shah Abdali. He was a powerful and influential figure in the region, and he played a key role in the Afghan invasion of India in the 18th century.
Ghulam Qadir Rohilla was a Rohilla chief who was the rival of Najib Khan. He was a ruthless and ambitious man, and he was responsible for the massacre of the Mughal emperor Shah Alam II in 1788.
Ali Muhammad Khan was a Rohilla chief who was the son of Najib Khan. He was a weak and indecisive ruler, and he was unable to maintain the power and influence of his father.
Hafiz Rahmat Khan was a Rohilla chief who was a contemporary of Najib Khan. He was a skilled military commander, and he was responsible for the defeat of the Mughal army at the Battle of Panipat in 1761.
Najib Khan was the most powerful and influential of the Rohilla chiefs. He was a confidant of Ahmad Shah Abdali, and he played a key role in the Afghan invasion of India in the 18th century.