B

Radical neck dissection removes the spinal accessory nerve, internal jugular vein and sternocleidomastoid muscle en bloc with cervical lymphatic tissue, while the digastric muscle is left intact and serves mainly as an anatomic landmark during the procedure [Ferlito et al., 2006, PMID 16889923; DeSanto & Beahrs, 1988, PMID 3046016].