系统解析:根据第二、三、四、五段的首句"First, happy workers enjoy the daily activities of their jobs, ...Take Tony Hawk, for example. ...Second, happy workers like the people they work with. Sally Ayote says, ..." ...Third, happy workers know that their work helps others. Caroline Baron's work helps people... ...Tony Hawk, Sally Ayote, and Caroline Baron all get great satisfaction from their work."可知,Tony Hawk, Sally Ayote, and Caroline Baron这三个人都从工作中找到了乐趣和满足感,故选D。