Correct option is B
- M.N. Roy, also known as Manabendra Nath Roy, was an influential Indian revolutionary and political theorist who played a significant role in the Indian independence movement.
- He was associated with the Communist Party of India (CPI) and later became one of the founding members of the Communist Party of India (Marxist) [CPI(M)].
- As an emigree Communist, he established several journals and publications to promote communist ideology.
- "Vanguard" was indeed an emigree Communist journal associated with M.N. Roy.
- It was founded by M.N. Roy in Berlin in 1920 and served as an important platform for disseminating communist ideas among Indian revolutionaries.
- Roy played a crucial role in publishing and editing "Vanguard," which became an influential publication within the Indian communist movement.