Concept:The separation of Orissa from Bihar happened in 1936 when the British reorganized provinces in India.
Explanation:Before 1912, Bihar and Orissa were part of the Bengal Presidency.
On 1 April 1912, both were separated from Bengal to form the Bihar and Orissa Province.
Later, on 1 April 1936, the British divided this province into two separate provinces: Bihar and Orissa.
Orissa became a distinct province with its own administration from that date.
This event is clearly recorded in Indian administrative history.
Therefore, the correct year is 1936.
Answer:Option A: 1936