The correct answer is the following: In his speech "Drive: the surprising truth about what motivates us", Dan Pink's tone could best be described as excited. Daniel H. Pink is an American author of several bestselling books about diverse topics, such as, business, work, behavior and motivation. One of his books is called "Drive: the surprising truth about what motivates us", in which the author uses an excited tone of speech to overturn the conventional wisdom about human motivation.