Read this excerpt. Scientists relied on which two methods to solve the mystery of how ancient people reached the islands?
A) news accounts of issues involving the Polynesian government and its laws
B) journal entries of people who disappeared from the island long ago
C) the success of an explorer who sailed on a raft from South America to Polynesia
D) measurements taken by research ships that study the tides in the area
E) DNA analysis of people on the islands compared to other people