You are answering a USMLE-style medical question. Question: A 45-year-old woman comes into your office with complaints of "lump" she found on her neck while showering. She denies any other symptoms and states that she has not gained any weight. On exam, you notice a 2 cm nodule on her anterior neck. Her TSH level is normal and radionucleotide scan reveals a cold nodule. Fine needle aspiration biopsy (FNAB) reveals follicular architecture suspicious for malignancy. What is the next best step? Options: A) Punch biopsy B) Surgical excision C) Thyroxine administration D) Ultrasound Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.