A 35-year-old man with a 10-year history of progressive night blindness and peripheral visual field loss presents to the retina clinic. Fundoscopy reveals mid-peripheral bone-spicule pigmentation, attenuated retinal arteries, and the structure marked C in the diagram. Genetic testing confirms a heterozygous RHODOPSIN mutation. Which of the following best explains the appearance of the structure marked C in this patient?

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