A 26 yrs old woman presents with a palpable thyroid nodule,and needle biopsy demonstrates amyloid in the stroma of lesion.A cervical lymph node is palpable on the involved side as the lesion,the preferred treatment should be

• A. Removal of the enlarged node,the isthumus,and the enlarged lymph node.
• B. Removal of the involved lobe,the isthumus,a portion of the opposite lobe,and the enlarged lymph node.
• C. Total thyroidectomy and modified neck dissection on the side of the enlarged lymph node.
• D. Total thyroidectomy and irradiation of the cervical lymph nodes.