Explanation:
B
Vagus nerve is a mixed nerve, It contains both afferent (sensory) and efferent (motor) fibers. It originates from the side of the medulla oblongata and has 5 brunches known as superior laryngeal, recurrent laryngeal, cardiac, pneumogastric, and depressor. It is the tenth pair of cranial nerves supplying the heart, lungs, upper digestive tract, and other organs of the chest and abdomen. Vagus nerve has the highest number of branches.