Special Agent Entrance Practice Exam

To determine if a sentence contains both an error in apostrophe use and an improperly used word, one must carefully analyze the grammatical structures and word choices within each sentence. If we look at Sentence 12, we need to identify an apostrophe error, such as the misplacement in possessive forms or incorrect contractions. Also, we should check for any words that are used incorrectly within the context, which could mean a word that is misused (e.g., using "their" instead of "there"). If Sentence 12 indeed shows both an apostrophe error and a misuse of a word, that confirms why this choice is the correct answer. The combination of these two distinct types of mistakes demonstrates a lack of understanding in both punctuation and vocabulary, which reinforces the answer's validity. In contrast, the other sentences likely contain either only one of these errors or none at all, which is why they don’t fulfill the criteria outlined in the question. Such a multi-faceted error makes Sentence 12 stand out as the option that fulfills the question's requirements.