Answer:
Letter C.
Step-by-step explanation:
The word Vikings are generally ascribed to the Scandinavian people who came from the lands to the north of the UK (nowadays, comprehending the territories of Sweden, Denmark and Norway), down to raid and pillage the lands of the northwestern Europe, mostly the British island and the Normandy region, at northernmost continental Europe. Which occured mainly by the end of the first millennium A.D (centuries VIII to XI, mostly).
However, these people were outstanding seafarers, and bold enough to press their naval ventures throughout the farthest lands and hardest seas! Evidences of their arrival at several different scattered locations around the globe, even centuries before Christ, have been found. Including the Americas.
Therefore, the Native Americans were first to arrive, evidently, then the Vikings, and only after the beginning of the second millennium AD, the Europeans, with their maritime expansions!