The second door with the lions. Since they haven't eaten in 5 years they will have died.
The answer is Frank. The mother named the kids with the first two letters of the days of the week.Monday is Marco, Tuesday is Tucker, Wednesday is Webster, Thursday is Thomas and Friday is Frank.
A mountain. A mountain is pointy when it is young and round when it is old.
They're all best friends. A diamond is a girl's best friend, a dog is a man's best friend, and a double play is a pitcher's best friend.