You are answering a USMLE-style medical question. Question: A 17-year-old female accidentally eats a granola bar manufactured on equipment that processes peanuts. She develops type I hypersensitivity-mediated histamine release, resulting in pruritic wheals on the skin. Which of the following layers of this patient's skin would demonstrate histologic changes on biopsy of her lesions? Options: A) Stratum corneum B) Stratum granulosum C) Stratum basale D) Dermis Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.