Step 1: Understand the context.
In the novel *The Guide* by R. K. Narayan, Nanukaka ties a red turban around the narrator's head, which is significant in the context of the story. The color and style of the turban help set the mood for the traditional setting.
Step 2: Analyze the options.
- (A) orange turban: Incorrect. While a turban could be orange, it is not described as such in this context.
- (B) green turban: Incorrect. The turban is not green in this story.
- (C) red turban: Correct. The turban is described as red in the novel.
- (D) yellow turban: Incorrect. The turban is not yellow.
Step 3: Conclusion.
The correct answer is "red turban." Nanukaka ties a red turban around the narrator's head in *The Guide*.