When Should You Use Commas with Phrases That Start with Who

When should you use commas with phrases that start with who, whose, which, when, or where?

A) You should never use commas with those words.
B) You should always use commas with those words.
C) You should use commas with those words if they are necessary for understanding the sentence.
D) You should use commas with those words if they are not necessary for understanding the sentence.

Correct Answer:

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