The problem with sentence 4 is that: the antecedent for "they" is unclear.
What is an antecedent ?An antecedent is the noun or pronoun that a pronoun refers to or replaces in a sentence.
The issue with sentence 4 is that option d is problematic due to the unclear antecedent for the pronoun "they," making it unclear who "they" refers to in the context of Parks pleading not guilty.
This lack of clarity can lead to confusion regarding the subject of the plea when reading the sentence, therefore, the last option is correct.
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