Which three ranks were present in the Ops Room?

The correct answer identifies the specific ranks that were present in the Ops Room as described in Roald Dahl's "Going Solo." The presence of Squadron-Leader, Flight-Lieutenant, and Sergeant highlights the hierarchical structure within the military setting, illustrating the dynamics and responsibilities of personnel in the operations area.

Squadron-Leader is a rank that denotes a leader of a squadron, while Flight-Lieutenant serves as a commissioned officer ranked below Squadron-Leader and above Pilot Officer. Sergeant, being a non-commissioned officer, typically holds a leadership position among enlisted personnel but operates under the direction of commissioned ranks. This combination reflects the operational hierarchy necessary for effective communication and command within military operations.

The other options fail to accurately portray the ranks discussed in the context of the Ops Room. While they may include ranks that exist within military structures, they do not align with the specific ranks mentioned in the narrative, hence not capturing the same sense of rank dynamics featured in Dahl's account.