Question

why is it difficult for historians to study early human societies?
choose 1 answer:
a written records from that time are indecipherable or meaningless
b before the advent of writing, historians had fewer and less detailed resources to work with
c there are no surviving artifacts or fossils from that time

Explanation:

Historians rely on records and artifacts to study past societies. Early human societies existed before writing was developed. Without written records, historians have fewer and less detailed resources. Artifacts and fossils do exist from early times (so C is wrong). And it's not that early written records (if any) are indecipherable/meaningless (A is wrong as early human societies often had no writing). The key is the lack of detailed resources due to no writing.

Answer:

B. Before the advent of writing, historians had fewer and less detailed resources to work with