The answer is 2: the "Treasures of Tutankhamun"
The title of the work is "Treasures of Tutankhamun", so it should be written inside the quotation marks <em>without the definite article</em> "the", since the article is not part of the title. There is another way of writing the title of a work in a sentence; it can be wrtten in italics. <em>Quotation marks and italics are used to make a title stand out.</em>
I think it is "declarative", because in the sentence, he/she is declaring he/she is gonna go to his/her cousin's house on the weekend, also an interrogative sentence is when it has a question mark.
What are the answers you have to choose from?
C would be the best, because it is the one that starts a discussion about the art and not just the museum. It also does not sound aggressive about liking the art himself. Hope this helps!