Which of the Following Statements Accurately Describes One of the Advancements

Which of the following statements accurately describes one of the advancements of the Inca kingdom?

A) The Incas were the only Native American group to own vast quantities of gold.
B) The Aztecs helped the Incas develop their empire, as these groups formed a close alliance.
C) The Incas were predominantly located along the Atlantic Ocean and pioneered shipbuilding.
D) The Incas refrained from expanding so that the empire was easy to manage.
E) The Incas developed a complex system of roads and bridges along the Andes mountain chain.