Answer : 4. "Banaras conspiracy case"
Explanation :

Martyr Kunwar Pratap Singh Barhath, who left an indelible mark in the freedom struggle, was arrested from Asha Nada railway station in Jodhpur and prosecuted by the British government. Sentenced to 5 years rigorous imprisonment and sent to Bareilly Central Jail. Where he died due to torture.

Pratap Singh Barhath was arrested in connection with the Banaras incident and in 1917, he was sentenced to 5 years of rigorous imprisonment in the Banaras conspiracy case.