Which of the Following Best Summarizes the Reasons for Human

Which of the following best summarizes the reasons for human migration throughout much of the globe?

A) Periodic climate change and population growth caused humans to range farther and farther afield in search of adequate food supplies.
B) Unlike earlier hominins, the human brain was inherently curious about the world and compelled early Homo sapiens to explore widely.
C) Early humans had little social organization, and as a result, members of a group often drifted from the larger community in a haphazard and unpredictable fashion.
D) Early humans followed the example of other hominin species, such as the Neanderthals, in their migration patterns.