Explanation:

- Option 1: Muzaffar Ahmed

- He was involved in the Kanpur Conspiracy Case of 1924.

- A prominent communist leader, he played a significant role in India's labor and communist movements.

- Option 2: Nalini Gupta

- He was indeed associated with the Kanpur Conspiracy Case.

- Nalini was actively involved in the communist and trade union movements in India.

- Option 3: Shaukat Usmani

- Usmani was also a key figure in the Kanpur Conspiracy Case.

- He was an important member of the Communist Party of India.

- Option 4: M.A. Ansari

- M.A. Ansari was not associated with the Kanpur Conspiracy Case.

- He was a notable freedom fighter, but not involved in this specific case.

Correct Answer: Option 4 - M.A. Ansari