Final answer:
An anatomical relationship between two structures in the human body can be described using directional terms. In this case, the mouth is anterior to the nose.
Step-by-step explanation:
An anatomical relationship between two structures in the human body can be described using directional terms. In this case, the correct answer is option A: the mouth is anterior to the nose. Anterior, also known as ventral, means towards the front of the body, so the mouth is situated in front of the nose.