Select the correct text in the passage. Which detail best develops the central idea?

The Footprints of Time
by Charles Bancroft
(excerpt from “Section VI. The Roman Republic”)
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Which sentence has an incorrect shift in pronoun-antecedent agreement? a) each teacher needs to be paired up. b) each man needs to carry his own load. c) each of these women runs their own business. d) each child should bring his or her own lunch.