Help with Variables For Student

Trying to help my student. Might be an issue with variables. He wants the block to turn the color specified in the drop down menu when clicked. App Lab - Code.org

When you say var x = "<color>" in one of the event functions, it creates a new variable that is defined only in that event scope (meaning, you can only use that variable in that function). If you get rid of the var keyword before it, then you will be able to access the global x variable and it should work.