Final answer:
The correctness of the elements presented in the question depends on their context within a sentence. Without the entire sentence, it is impossible to definitively identify which element is incorrect.
Step-by-step explanation:
Without the context of the entire sentence it is difficult to determine which element is incorrect. Sentence error identification greatly depends on how a sentence is structured. Each option provided ("Down the road", "until", "them", and "A police officer") could be either correct or incorrect based on their usage within a sentence. For instance, in sentence A, 'Down the road' might be correct if it physically describes where something is located but could be incorrect if it's used to indicate a time span, in which case 'until he stopped' would be an appropriate replacement. All these options require context to determine their correctness.
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