Who was the founder of the Magadha Empire according to early historical records?

The key to this question is the precise association expressed in its wording: “Who was the founder of the Magadha Empire according to early historical records?” The answer Bimbisara matches that clue directly and is therefore factually appropriate. Option B — Ajatashatru — is incorrect because it does not match the exact person, district, location, institution, river, event or identifying feature required by the question. Option C — Jarasandha — is incorrect because it does not match the exact person, district, location, institution, river, event or identifying feature required by the question. Option D — Mahapadma Nanda — is incorrect because it does not match the exact person, district, location, institution, river, event or identifying feature required by the question. Bihar GK questions frequently place neighbouring districts, related historical personalities, nearby rivers or institutions from the same field among the options. The correct method is to identify the central clue, match it with the relevant map location, historical period or official designation, and then eliminate every alternative separately. Bimbisara is considered one of the earliest and most important rulers of Magadha.