Which of the Following Best Summarizes Zelinsky's Theory of First

Which of the following best summarizes Zelinsky's theory of first effective settlement?

A) That the first people to arrive in an area gain an advantage over subsequent groups.
B) That groups who are the first to successfully settle a place have the longest impacts on its cultural landscape.
C) That the first treaty to be agreed upon is not always the most effective.
D) That the first group to attempt to settle an area will be successful if they adapt to their new environment.