How can the issue with the line variable in the drawing code be resolved?

The resolution of the issue with the line variable in the drawing code hinges on how variables are scoped and utilized in functions. Declaring a variable with the var keyword creates a local variable if it’s defined inside a function, which means that its scope is limited to that function only. When you assign to a variable using the var keyword within another function, such as the down function, it creates a separate instance of the variable rather than referencing the original declaration.

By removing the var keyword when assigning in the down function, you allow the function to reference the existing line variable that is likely declared outside of any specific function—a global scope. This way, all functions can access and modify that single line variable, maintaining its state throughout the program. This is crucial for the intended behavior of the drawing application, where consistent updates and drawings depend on the same line variable being manipulated across different functions.

The other options suggest alternative methods to handle the variable but they do not address the core issue of variable scope in the same way. For instance, declaring the line variable inside the start function would confine it to that function, rendering it inaccessible elsewhere. Initializing the line with a default value doesn’t help if the variable isn’t accessible where