Which two organizations merged to form the RAF?

The formation of the Royal Air Force (RAF) in 1918 resulted from the merger of the Royal Flying Corps (RFC) and the Royal Naval Air Service (RNAS). This unification was driven by the need for a more coordinated and efficient use of aerial resources during World War I. The RFC was initially established as the air arm of the British Army, while the RNAS was created as the air arm of the Royal Navy, each focusing on their respective operations. The strategic importance of air power became increasingly evident during the war, leading to the decision to combine these two entities to form a single independent service: the RAF. This merger allowed for better resource allocation, training, and operational capabilities, ultimately enhancing the effectiveness of British military aviation.

The other options do not accurately reflect the historical context of the RAF's formation, as they involve organizations that either did not exist during the exact time of the RAF's establishment or did not play a role in the formation of the RAF itself.