It’s B because y has a -3
The turning point was the establishment of Jamestown, now in Virginia. This means that Europeans for the first time settled in the US, with the objective of staying - and they and their ancestors stayed to this day.
It is a major turning point because before it, the Americas were not inhabited by non-native Americans, and after this point, they were are continuing to be inhabited by Europeans and their ancestors.
President Ford's policy toward the Soviet Union focused on "<span>c. continuing to pursue detente" since this system seemed to be working relatively well and Ford did not want to alter it. </span>
