Final answer:
The correctly punctuated sentence is: The Censorship Division building, where Juan worked, was crowded and noisy on the outside, and busy and silent on the inside.
Step-by-step explanation:
The sentence that is correctly punctuated is:
The Censorship Division building, where Juan worked, was crowded and noisy on the outside, and busy and silent on the inside.
This sentence is correctly punctuated because it uses commas to set off the nonessential phrase 'where Juan worked' and to separate the two independent clauses 'The Censorship Division building was crowded and noisy on the outside' and 'it was busy and silent on the inside'.
Using proper punctuation helps to clarify the structure of a sentence and improve its readability.
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