Why do scholars believe Spanish conquistadores never discovered or entered Machu Picchu during the conquest of the Inca empire?
A. Cortez kept a diary that describes his fruitless search for the Inca capital
B. because the site was under water at the time
C. we know the city had already been destroyed by the Aztecs
D. books written in ancient Inca hieroglyphs tell us the site remained hidden
E. the Intihuatana at this site is intact and unbroken