Answer :
The sentence that correctly uses punctuation to show a quick change between ideas is: A: After you get back from your trip, be sure to upload photos, check your mail, and water your plants.
In this sentence, the comma was used to separate items in a list. The correct use of punctuation marks helps us to have a better grasp of sentences. In sentence A above, several activities were mentioned.
To help the reader differentiate the activities, the comma was used to separate them.
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