Explanation:

• India House was established in London in 1905 by Shyamji Krishna Varma. It became a hub for Indian students and political activists advocating for Indian independence through revolutionary and militant methods.
• Prominent revolutionaries like Vinayak Damodar Savarkar, Madan Lal Dhingra, and Lala Har Dayal were associated with it. It aimed to foster a sense of nationalism and train youth for armed struggle against British colonial rule.
• Forward Bloc was formed by Subhas Chandra Bose in 1939 after his differences with the Congress leadership. It was an India-based political movement, not founded abroad.
• Khilafat Committee was an Islamic political campaign launched in India (1919–1924) to protect the Ottoman Caliphate and was not focused on Indian armed revolution abroad.
• Servants of India Society, founded by Gopal Krishna Gokhale in 1905, promoted social reform, education, and constitutional methods—not armed revolt.

Source: Spectrum’s A Brief History of Modern India