The correct answer is option 2, G.K Gokhale. G.K Gokhale was a prominent Indian political leader and a social reformer during the late 19th and early 20th century. He was known as the `political guru` of Mahatma Gandhi because he had a significant influence on Gandhi`s political ideologies and teachings.

Gokhale was a senior leader of the Indian National Congress and believed in the principles of moderation, constitutional reforms, and peaceful negotiations with the British government for India`s independence. He strongly advocated for a united India with people from all religions and communities living together harmoniously.

Gandhi, who considered Gokhale as his mentor, learned many valuable lessons from him, including the power of non-violence, Satyagraha (truth-force), and the importance of grassroots movements. Gokhale`s teachings deeply influenced Gandhi`s approach towards social and political activism.

While other options are also leading figures during the freedom struggle, it was G.K Gokhale`s guidance and principles that played a critical role in shaping Gandhi`s political ideologies, making him his `political guru`.