Final answer:
The correct sentence punctuation is option C: Some may think the sky is blue; however, it has multiple different colors.
Step-by-step explanation:
The correct sentence punctuation is option C: Some may think the sky is blue; however, it has multiple different colors. In this sentence, a semicolon (;) is used to separate two independent clauses that are closely related. The word 'however' is also correctly punctuated with a comma (,).
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