Short passage from ETS book

GRE Verbal Problem Solving
1

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The answer is both A and B. For B, the given explanation is

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The passage nowhere mentions that Toltec is an ancient American language whereas the option does. For someone who doesn’t know this would ideally not choose this option. How is the answer justified in this case?

2

Its a inference. Because some part of Nahuatl is derived from it , hence it also make it(Toltec) an ancient language