The correct answer is option 4, Mohammad Ali Jinnah.

Direct Action was a political strategy adopted by the All India Muslim League, led by Mohammad Ali Jinnah, in 1946. It aimed to pressurize the British government and the Indian National Congress to recognize the demand for a separate Muslim-majority state, which eventually led to the creation of Pakistan.

Option 1, Subhash Chandra Bose, was a prominent leader of the Indian National Congress and later formed the Forward Bloc, which aimed at achieving complete independence from British rule. However, Bose did not come up with the concept of Direct Action.

Option 2, Mahatma Gandhi, was a key figure in India`s struggle for independence. While he advocated for nonviolent resistance and civil disobedience, he did not propose or support the idea of Direct Action.

Option 3, Mohamed Ali Jauhar, was a prominent leader of the Khilafat Movement and the Indian National Congress. He did not conceptualize Direct Action as a strategy for political agitation.

Therefore, the correct answer is option 4, Mohammad Ali Jinnah, who led the All India Muslim League and proposed the strategy of Direct Action to advocate for a separate Muslim state.