Explanation:

Let's analyze the historical context of the Obra Thermal Power Centre's establishment. \nOption A: The Obra Thermal Power Plant, located in the Sonbhadra district of Uttar Pradesh, India, was established with significant technical and financial assistance from the then Soviet Union (Soviet Russia) during the 1960s. This collaboration was part of India's broader strategy to develop its industrial and energy infrastructure with international support. Therefore, Soviet Russia is the correct answer. \nOption B: Japan has been a significant partner in India's infrastructure development, particularly in recent decades, but it was not the primary supporter for the establishment of the Obra Thermal Power Centre. Therefore, Japan is incorrect. \nOption C: Germany has also contributed to various industrial projects in India, but its support was not instrumental in the initial establishment of the Obra Thermal Power Centre. Therefore, Germany is incorrect. \nOption D: The United States (America) has had economic ties with India, but the Obra Thermal Power Centre's foundational support did not come from the USA. Therefore, America is incorrect. \nThus, the Obra Thermal Power Centre was established with the support of Soviet Russia.