Final answer:
The sentence that uses punctuation correctly is 'We only have one rule here at Sprinkles Ice Cream Shop, make up your mind before you get in line.'
Step-by-step explanation:
The sentence that uses punctuation correctly is:
We only have one rule here at Sprinkles Ice Cream Shop, make up your mind before you get in line.
This sentence correctly uses a comma to separate the introductory phrase 'We only have one rule here at Sprinkles Ice Cream Shop' from the main clause 'make up your mind before you get in line'. The comma helps to clarify the structure of the sentence and improve readability.
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