<span>the fact that 1/3 of people were considering themselves independent, or not aligning with either political party.</span>
Very early societies did not have a written language or even ways to efficienly preserve information, so we can reject the options "maps" and "written records".
As far as the other two options go - ice core samples and tree rings, both are correct! probably "ice core" samples are the better answer, since only fossilized tree rings would tell us about the very early societies.
Answer:
c
Explanation:
18th century political revolution in Europe and the Americas