Final answer:
The correct sentence is 'c. Kentucky, Georgia, and Tennessee—these were states in which we earned the most money,' where a dash is used to emphasize the second clause.
Step-by-step explanation:
The correctly punctuated sentence from the provided selections is c. Kentucky, Georgia, and Tennessee—these were states in which we earned the most money. This structure is known as an appositive, where two clauses are juxtaposed, and a dash is used to add emphasis to the second part of the sentence by setting it off from the list of states. When dealing with punctuation, it's essential to choose the correct punctuation mark to ensure the sentence is clear and grammatically correct.
An example of how to use punctuation marks correctly is, 'The roof of that car was covered in Astroturf—a strange sight!' compared to 'Quentin's father gave him a golden pocket watch, which was a priceless family heirloom.' Use a dash to add emphasis to the phrase that follows or a comma for a less emphatic separation. In sentence corrections, replace a comma splice with a period, semicolon, or coordinating conjunction, and correct sentence fragments by either removing the semicolon entirely or by replacing it with a comma or dash.