Hello. You didn't show which words are underlined, so I'll give you the grammatical name and function of all of them.
What: Pronoun. It has the function of referring to or replacing a noun, representing something, which does not have a specific name, but which needs to be represented in the sentence. The pronoun is a variable word.
To do: Verb. It has the function of representing an action, an activity that will be performed by something or someone.
Is: Verb. It has the ability to represent a state or occurrence.
Problem: Noun. It has the function of naming something or someone.
Answer: The answer is , For spring break my family will visit Washington D,C, Which is the capitol of the united states.
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Explanation: A dependent clause it a clause that cannot stand on its own as a sentence because it only provides extra information to a sentence. Therefor, B would be your answer because The sentence provides the extra information which it that Washington D.C is the capitol of the United States. So, Instead of the Phrase "For spring break, my family will visit Washington D.C." It will become "For spring break,my family will visit Washington D.C <u><em>
Which is the capitol of the United States.</em></u></h3><h3><u><em>
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Hope this helps and explains better :)</h3>
I believe it is C the others don’t seem like they would necessarily be unreliable but C definitely is
I believe the answer is B
The question you asked contains a "pun"