Correct Answer: (b) 618 A.D.
Note: Harsha's southward march was stopped on Narmada river by the Chalukya king Pulakeshin who ruled over a great part of modern Karnataka and Maharashtra with his capital at Badami in the modern Bijapur district of Karnataka. According to Altekar, the battle between Harsha and Pulakesin was fought sometime between 630 to 634 AD. The first reason in support of, this battle is the result between battle of the Vallabhi which itself cannot be said to be fought before 630 AD. Again Pulakeshin's lohnara inscription of 630 AD which mentions the name of his defeated enemies do not iclude the name of Harsha, but Aihole inscription of 634 AD mentions this battle. In these conditions, the correct timing be between 630 AD and 634 AD, so the nearest answer can be option (d). In April 2016, researchers from the Bhandarkar oriental Research institute claimed that the date of Pulakeshin's great triumph over Harsha could be fixed at 618 AD. This information was based on a recently discovered copper plate inscription of Pulakeshin II. Jharkhand Provincial Service Commission has accepted option (b) as the correct answer.