Final answer:
The sentence with appropriate punctuation uses a colon to separate the main clause from the explanation that follows.
Step-by-step explanation:
The sentence with appropriate punctuation is: The concert was fantastic: the band played all their hits.
The correct sentence uses a colon after 'fantastic' to separate the main clause from the explanation that follows.
Correct punctuation helps to improve the clarity and understanding of written communication.
Learn more about Punctuation in English sentences