What did Sarah suggest regarding Jim's trip?

The correct choice emphasizes a strong recommendation made by Sarah regarding Jim's trip. The phrase "that Jim should put off his trip" clearly communicates a suggestion with a sense of obligation or advisability, indicating that Sarah believes it would be wise for Jim to delay his plans.

The other options do not convey the same level of suggestion or urgency. "Jim might delay his trip" suggests a possibility rather than a recommendation, which is less decisive. Similarly, "Jim could postpone his trip" provides an option without indicating that Sarah believes this is the best course of action. "Jim will defer his trip" implies a certainty about the action being taken, rather than a suggestion. This lack of defined advice in those alternatives differentiates them from the clarity and authority of the correct choice.