A 70-Year-Old Man Complaining of a Small Painless Swelling Below

A 70-year-old man complaining of a small painless swelling below his chin visited his physician. On questioning, he said that he had first noticed the swelling 4 months earlier and that it was gradually increasing in size. Because it had not caused any discomfort, he had chosen to ignore it. On examination, a single, small, hard swelling could be palpated in the submental triangle. It was mobile on the deep tissues and not attached to the skin.
-The following statements suggest that the hard swelling is a secondary malignant deposit in a lymph node except which?

A) The submental lymph nodes are located in the submental triangle just below the chin.
B) The submental lymph nodes drain the tip of the tongue, the floor of the mouth in the region of the frenulum of the tongue, the gums and incisor teeth, the middle third of the lower lip, and the skin over the chin.
C) A small, hard-based carcinomatous ulcer was found on the right side of the tongue near the tip.
D) The deep cervical group of lymph nodes beneath the sternocleidomastoid muscle receive lymph from the submental lymph nodes.
E) The submental lymph nodes lie deep to the superficial part of the submandibular salivary gland.