Concept:Discoveries of the Eastern and Western era are linked with settlements connected to the Zambezi and Limpopo rivers.
Explanation:Historically, the Eastern and Western era produced many archaeological and cultural discoveries.
The most reliable evidence of these discoveries comes from the area associated with the Zambezi and Limpopo rivers.
These two river regions provided water, fertile land, and migration routes for early people.
As a result, most remaining discoveries are found within these river zones.
The blank requires a pair of names, not a single river or a general primitive period.
Only the option that names both rivers correctly completes the sentence.
Answer:B. Zambezi and Limpopo period