Which one of the following was initially the most powerful city state of India in the 6th century B.C.?

1. The question asks to identify the most powerful city state (Mahajanapada) in India during the 6th century B.C. 2. Gandhar and Kamboj were Mahajanapadas located in the northwestern part of the subcontinent. 3. Kashi (Varanasi) was an important city-state, known for its wealth and culture, but it was eventually absorbed by Kosala and later Magadh. 4. Magadh, located in the fertile Ganges basin with access to resources like iron ore and timber, gradually rose to prominence. Under rulers like Bimbisara and Ajatashatru in the 6th-5th centuries BC, it began expanding its influence and became the dominant power among the Mahajanapadas. 5. Therefore, Magadh was initially the most powerful city-state during this period.