Chittaranjan Das was the political guru of which of the following personalities?

Correct option is A

Chittaranjan Das, popularly called Deshbandhu (Friend of the Nation) was the Political Guru of Indian freedom fighter Netaji Subhas Chandra Bose.
Chittaranjan Das - He was the founder-leader of the Swaraj Party along with Motilal Nehru, founded in 1923. His name is abbreviated as C. R. Das.
He published a newspaper called Forward and later changed its name to Liberty as part of his support for various anti-British movements in India.
When the Calcutta Municipal Corporation was formed, he became its first mayor.
Subhas Chandra Bose – He joined the Indian National Congress (Formed on December 28, 1885) in 1921. He also started a newspaper called 'Swaraj'.
 Subhash Chandra Bose was elected as the president of the INC at the Haripura session held in February 1938. The Haripura session took place in Haripura, Gujarat.
 He established the All-India Forward Bloc to support the freedom struggle as a division of Congress in 1939.