People who do not believe that others distrust them are confident in their own abilities, so people who tend to trust others think of a difficult task as a challenge rather than a threat, since this is precisely how people who are confident in their own abilities regard such tasks. The conclusion above follows logically if which one of the following is assumed? ["Confidence in one's own abilities gives one confidence in the trustworthiness of others.", 'People who are not threatened by difficult tasks tend to find such tasks challenging.', 'People who tend to trust others do not believe that others distrust them.', 'People tend to distrust those who they believe lack self-confidence.']