Answer: My favorite building personally is The World Trade Center (previously known as the Twin Towers) What I like about it so much is 2 things, 1. It has a lot of history behind it, it was a terrorized attack led by Osama bin Laden, the leader of the attacks on Pentagon too, and my second thing is the height, 1,776, and if you didn't know, they specifically done this because The Declaration of Independence was signed on August 2, 1776. But in all, The World Trade Center is a really cool place.
Explanation:
"A. childrens'" is the proper answer because the musem belongs to the children, which is plural. If a single child owned the museum somehow, it would be The Child's Museum.
D. Elves and dwarves are found in the Norse mythological system.