The speaker as evident in textual evidence from the excerpt supports the validity of his claim about how society develops; by asserting that the community will expand.
How does the speaker support the validity of his claim about how a society develops?
It follows from textual evidence in the task content that; ...The more than four citizens will be required; for the husbandman will not make his own plough or mattock, or other implements of agriculture.....
It therefore follows from the extracted excerpts that the speaker believes the society would expand as a result of services required within the society and on this basis is the support for his claim about how a society develops.
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