The correct answer is option 1: Brahmi. Brahmi script was used in Ashoka`s inscriptions.

Option 2: Devanagiri script is incorrect. Devanagiri script is primarily used for writing the Sanskrit, Hindi, and Marathi languages and was developed much later than the Ashoka period.

Option 3: Gurmukhi script is incorrect. Gurmukhi script is used for writing the Punjabi language and was developed during the Sikh Guru period, which came several centuries after Ashoka`s time.

Option 4: Sanskrit is incorrect. Sanskrit is not a script but a classical language of India. It is believed that Ashoka`s inscriptions were written in Prakrit, an ancient language derived from Sanskrit and spoken by the common people.

Therefore, option 1: Brahmi is the correct answer.