Final answer:
The specific context from the book or story where Trevor is a character is required to accurately answer how he got covered in mulberry juice. Without context, a definitive answer cannot be provided.
Step-by-step explanation:
The student's question is about how a character named Trevor got covered in mulberry juice. To answer this question accurately, the specific context from the book or story in which Trevor is a character is required. Without context, it is impossible to provide a definitive answer.
However, if this question refers to a known story in literature or class reading, one might look at the text to find the correct answer between options a, b, c, and d. In a situation where Trevor is a character in a story, his being covered in mulberry juice might be intended to add humor or to show a consequence of an action or event within the narrative.