Final answer:
Option (A), Trevor and Abel share a relationship akin to the Biblical brothers Cain and Abel, suggesting they are siblings marked by rivalry and conflict.
Step-by-step explanation:
The relationship between Trevor and Abel, referencing a “Cain and Abel-type” dynamic, suggests a complex and potentially antagonistic relationship, likely embodying themes of rivalry, jealousy, and conflict. Since the question explicitly mentions the biblical allusion to Cain and Abel, we can deduce that Trevor and Abel's relationship is one of sibling rivalry, which would make them siblings (Option A).
The story highlights how family relationships, particularly between brothers, can be fraught with tension, reflecting the Biblical narrative of Cain and Abel where Cain, driven by jealousy, kills his brother Abel.