Could be false. No comparison was made between scholars and diplomats on the one hand versus most presidents and prime ministers on the other in terms of who has more experience in foreign affairs.

Must be true. The first sentence proves that prior experience is not necessary. Some leaders succeeded without any prior experience. The last sentence proves that prior experience is not sufficient. If a leader has prior experience yet lacks all three traits, they won’t be successful.

Must be false. The first sentence proves that prior experience is not necessary. Some leaders succeeded without any prior experience.

Could be false. The stimulus proves that the three traits are jointly sufficient. Together they guarantee success. But that’s not to be confused with being individually necessary. There could be other ways to be successful.

Could be false. There is no information in the stimulus that suggests that prior experience is the deciding factor. Hence, we cannot be sure of the comparison that a leader with prior experience will be more successful than one without.