Step 1: Observing the camera types.
Among the four options, each camera represents a different technological era. Only one of them belongs to the early bellows-style film cameras from the early 20th century.
Step 2: Analysis of options.
- (A) A: A mid-20th-century film camera, but not the oldest.
- (B) B: A modern digital camera from the 2000s.
- (C) C: A classic folding bellows camera, used widely in the early 1900s — clearly the oldest.
- (D) D: A twin-lens reflex camera, older than A but still newer than the bellows camera in C.
Step 3: Conclusion.
Thus, the oldest camera in the set is the folding bellows camera shown in Option C.