Final answer:
The facial nerve, cranial nerve VII, is responsible for tears, saliva, taste, and facial expressions. It contributes to both sensory and motor functions and also affects taste in the anterior part of the tongue.
Step-by-step explanation:
The cranial nerve responsible for tears, saliva, taste, and facial expressions is the facial nerve, also known as cranial nerve VII. This nerve has a complex structure and function, mediating both the sensory and motor pathways. It not only helps with facial expressions but also plays a role in the production of saliva and tears. Additionally, the facial nerve is crucial for the sense of taste in the anterior two-thirds of the tongue. So, for the question posed, the correct answer would be B. VII, which corresponds to the facial nerve.