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The people known as Sumerians are credited as starting the first civilization and building the first settlements worthy of being called cities.
This answer choice is grammatically incorrect. The correct preposition after the verb credited is with.
While this answer choice corrects the original preposition mistake, it is stylistically flawed. The addition of the word also creates redundancy.
This answer choice is both grammatically incorrect and stylistically flawed (redundant). The correct preposition after the verb credited is with.