The sentence given in option (g) i.e. “This summer, we are going on a road trip to Philadelphia, Pennsylvania, Baltimore, Maryland, and Rehoboth Beach, Delaware.” requires semicolons instead of commas.
One use of a semicolon (;) is to create a smooth link between two related ideas in a list of items that is lengthy and contains internal commas.
For example, in the sentence “This summer, we are going on a road trip to Philadelphia, Pennsylvania; Baltimore, Maryland; and Rehoboth Beach, Delaware.”, it is preferred to use semicolons to provide more clarity and to organize the list of places to be visited.
In the sentence, semicolons separate each state name with its capital from the rest and provide a clear understanding that the capital of each state will be visited only.
With the comma in the sentence, it reads like all the places are different and will be visited separately. However, with semicolons a connection between two places (state and its capital) is established that keeps division between the capitals of each state to be visited within the given list of visiting places.
You can learn more about semicolons at
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