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The correct answer is option 3, Navsari Copper plate Inscription. The inscription refers to Harshavardhan`s conquest of Vallabhi. This particular inscription is a copper plate inscription found in Navsari. Copper plate inscriptions were often used to document important events or grants made by rulers. It is likely that Harshavardhan`s victory over Vallabhi was considered significant enough to be recorded in this manner. The Aihole Pillar Inscription (option 1) and the Junagadh Inscription (option 2) do not mention Harshavardhan`s Vallabhi conquest and are therefore not the correct choices. The Damodarpur copper plate Inscription (option 4) is not related to Harshavardhan`s conquest of Vallabhi. Therefore, based on the available information, the correct answer is option 3.