Explanation:

- Option 1: Prafulla Chaki

Prafulla Chaki was involved in the revolutionary activities against the British, most notably known for his role in the attempt to assassinate a British official, but he wasn't part of any plan involving cooperation with Germany.

- Option 2: Ashfaqulla Khan

Ashfaqulla Khan was a key figure in the Kakori conspiracy of 1925, aiming to loot a train carrying British money, but there was no association with Germany in his plans.

- Option 3: Khudiram Bose

Khudiram Bose was one of the youngest revolutionaries in India and is known for his role in the Muzaffarpur Conspiracy, but he did not involve Germany in his insurgency plans.

- Option 4: Bagha Jatin

Bagha Jatin was indeed the revolutionary who conceived the idea of an armed insurrection against the British, planning in cooperation with Germany during World War I. ??