The sentence that doesn not contain any punctuation errors is <span>B.Be careful with that glass; it's very expensive!
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When two completely different ideas or sentences are joined together in one sentence, they should be separated by a semicolon. This denotes that the two are related, but are not the same idea. To use a semicolon, just retain the full sentences and add a semicolon between them.
The answer is C, “how to solve the problem?”
C is the only sentence that uses commas correctly.
