Bananas is one important reason that bantu speakers were successful in spreading their culture were introduced to Sub-Saharan Africa. This was useful because Bantu-speaking people could now migrate to places where yams did not grow easily.
The Bantu would travel in canoes across Africa's waterways and would stop at different areas to farm for some years. This can be how they spread their farming, iron working skills and language.
One of the primary sub-Saharan states in the geographic region to realize attention within the wider medieval culture world was the Ghana Empire (6-13th century CE), located in modern-day southern Mauritania and Mali.
The principal consequences of the Bantu migration, then, could also be summarized as: the spread of the Bantu and Bantu-related languages. the spread of iron-smelting and smithing technology. the spread of pottery techniques. These pioneers then shared their more advanced technologies (and, within the process, their languages) with the locals.
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The correct answer is B. Trust, competence and ethos.
The speaker will inspire credibility from the audience when it perceives his or her character and their ethos concerning the topic they are presenting. If they know it really well, they will speak with authority, which will engender trust. Their competence is manifested and it's easier for the audience believe and received what it's being conveyed.