Explanation
The correct answer is B: Vagus.
The vagus nerve, also known as the tenth cranial nerve, is a mixed nerve in humans, meaning that it contains both sensory and motor fibers. It is one of the longest nerves in the body and runs from the brainstem down to the abdomen, serving various organs such as the heart, lungs, and digestive system.
The optic nerve (A) is a sensory nerve responsible for transmitting visual information from the eyes to the brain.
The trochlear nerve (C) is a motor nerve responsible for controlling the superior oblique muscle of the eye, which helps with eye movement and focusing.
The olfactory nerve (D) is a sensory nerve responsible for the sense of smell.
