Final answer:
Without context, determining how Jethro expresses regret is not possible. Common methods include through a letter, a gift, verbally, or silently, depending on the narrative's details.
Step-by-step explanation:
The question seems to be referring to a character named Jethro from a piece of literature. Without additional context, it's impossible to answer definitively, but typically when characters express regret, they do so in a manner that is significant within the narrative. If Jethro is a character from a specific book or story, the way he expresses regret would be detailed within the text.
For example, if Jethro wrote a letter to someone he wronged, the answer would be 'a) Through a letter'. If he apologized to them in person, it would be 'c) Verbally'. Since there isn't enough context in the question to provide a specific book or situation, this is as detailed as the answer can be.