A 30-year-old woman from Barcelona has noted enlargement of her neck over the past 4 months. On physical examination, she has a diffusely enlarged thyroid that is not painful to palpation. Her TSH level is 0.2 mU/L (decreased). A subtotal thyroidectomy is performed and histologically the tissue shows follicles with papillary infoldings lined by tall columnar cells. Which of the following is the most likely diagnosis? A. Subacute granulomatous thyroiditis B. Papillary carcinoma C. Multinodular goiter D.  Hashimoto thyroiditis E. Graves disease