The impact of trade on the people of Southern and Eastern Africa includes significant cultural exchanges, the spread of new religions, and economic changes. Based on the provided options, none explicitly mention the influence of trade. However, if we're to infer a correct response regarding the impact of trade on these regions, we could consider that trade often led to a blending of cultures and the introduction of new practices, including the adoption of different religions and economic interactions.
An accurate depiction of the impact of trade would likely involve mentioning the introduction of new religious beliefs or economic relations rather than the continuity of ancestral practices or isolation.
Since the provided responses seem incomplete, could you please provide the full list of options? This way, I can assist you better in selecting the appropriate example of trade's impact.