Answer:
D. Leonardo da Vinci—inventor, painter, and poet—is considered a true genius
Step-by-step explanation:
Dashes have been used to give some relevant information about the subject: Leonardo da Vinci. The dashes have been used between the nucleus of the subject and the predicate.The dashes make the reader draw his / her attention to the information given between them. Then, the information is a set of characteristics which are enumerated. Enumeration is indicated, in this case, by commas.