The nature of English literature reflects the rich and diverse vocabulary of the English language, which resulted from the dual influence of the Anglo-Saxon and, later, French languages. The French language, though, is a direct descendant of Latin, with few traces of the Celtic language spoken hallmark of French literature is its simplicity and clarity.
What this question is testing
Premises
The first sentence does most of the work. English literature reflects the rich, diverse vocabulary of English. And English's rich vocabulary came from its origins — Anglo-Saxon plus later French influence.
Evaluate
Connect those two ideas:
Origins → vocabulary. Vocabulary → literature. So origins → literature.
The rest of the stimulus (about French literature being simple and clear) is filler that supports the same idea — that the linguistic ancestry of a language helps shape its literature. But the cleanest path is the chain in the first sentence.
Goal
Find an answer that says, in some form: the origin of English helped shape English literature.
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