Correct option is A
The person who commented on Gopal Krishna Gokhale's death in 1915 by saying, "Truth was the spring of all his actions" was (a) M.K. Gandhi.
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Gopal Krishna Gokhale (1866–1915) was the political mentor and guide to Mahatma Gandhi. Gandhi often referred to Gokhale as his Guru (teacher).
Gokhale died on February 19, 1915, shortly after Gandhi's permanent return to India from South Africa (January 1915).
In his autobiography, The Story of My Experiments with Truth, Gandhi repeatedly praised Gokhale's character, emphasizing his complete honesty and dedication. The quote "Truth was the spring of all his actions" perfectly reflects the profound ethical impression Gokhale made on Gandhi, whose entire philosophy of Satyagraha was built on Truth (Satya).