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Final answer:The sentence that is punctuated incorrectly as to its introductory element is (d) Our best guesses proving incorrect, we left the safe for someone else to crack.Explanation:The sentence that is punctuated incorrectly as to its introductory element is:d) Our best guesses proving incorrect, we left the safe for someone else to crack.In this sentence, the introductory element is "Our best guesses proving incorrect." However, there should be a comma after this introductory phrase to separate it from the main clause "we left the safe for someone else to crack." The correct punctuation should be:Our best guesses proving incorrect, we left the safe for someone else to crack....