The graph shows temperatures in Greenland from 500 CE to 1990 CE. A line graph titled Temperature Changes in Greenland. The graph shows Year on the x-axis, from 500 to 1990, and Temperature Changes (in degrees Celsius) on the y-axis, from Colder to Warmer. The coldest temperatures are at the following Years: 650, 850, 1100 to 1200,1350, 1700, and 1850.

What can these data help historians understand about the Viking settlements in Greenland?

O that the Vikings enjoyed consistently warm temperatures while they lived in Greenland
O that the Vikings were careful to settle in areas that would support year-round agriculture
O that colder temperatures starting in about 1300 may have forced the Vikings to leave Greenland
O that the Vikings probably arrived in Greenland by about 1000, when the temperatures were cooler