Final answer:
The word peevish suggests that Cassius does not think Octavius should be taken seriously.
Step-by-step explanation:
The word peevish helps the reader understand Cassius's feeling toward Octavius by suggesting that he does not think Octavius should be taken seriously. This is option d) I, IV. The word peevish implies annoyance or irritation, which indicates that Cassius does not have a high regard for Octavius and views him as insignificant or unworthy of consideration.