Final answer:
The correct answer is Option C, which suggests inserting a comma after 'sketchy' to improve the sentence's clarity. Accurate punctuation is essential for clear communication.
Step-by-step explanation:
The change that should be made to the sentence "If you think those last three sound sketchy you should" is to insert a comma after 'sketchy.' Therefore, the correct answer is Option C. A comma is needed to separate the independent clause "If you think those last three sound sketchy" from the dependent clause that presumably follows. Without the comma, the sentence is a run-on and difficult to read.
When it comes to other issues of grammar and sentence structure, it's important to consider the subject-verb agreement, the placement of commas for clarity, the accuracy of word choices, and defining a clear subject and action in sentences. For instance, "There are fewer criminals on the street since the law was passed" could be revised to "The law has reduced the number of criminals on the street." This edit brings the doer, 'the law,' directly into the action of reducing crime, creating a more impactful sentence.