Striae of Retzius are prominent in which of the following zones of enamel caries:: (A) Translucent zone., (B) Dark zone., (C) Body of the lesion., (D) Surface zone.
Answer is C. Body of the lesion

Between unaffected surface and dark zone
Area of greatest demineralization
Pore volume – 5% in periphery and 25% in center
Quinoline inhibition – body appears transparent
Water inhibition – Positive birefringence compared to sound enamel
Striae of Retzius - prominent