A C D
A. Makes your code easier to read and know what variables do.
C. Explains what a line of code does and makes it easier to understand what certain functions and variables are for.
D. Some languages require correct line breaks others do not, no matter what it makes it easier for a human to read your code.
This is hard to read.
EX. (function(){console.log(1);})();
This is easier
function(){
console.log(1);
}
();