Final answer:
Aratus' work uses mythology to discuss moral and philosophical topics, reflecting the gradual shift from mythos to logos in ancient philosophical thought.
Step-by-step explanation:
Aratus' work demonstrates the use of mythology to illustrate moral and philosophical points. This intertwining of mythology with moral and philosophical narratives is part of the wider transition from mythos to logos, a concept which signifies the shift from supernatural explanations (mythos) to rational, logical, and scientific explanations (logos). This shift was not abrupt but rather a gradual and complex process, as seen in the works of early philosophers across ancient civilizations who often used mythological elements to express rational ideas and vice versa. The correct answer to the student's question is option (a) Moral; Philosophical.