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[ Option A ]

In JavaScript, the main difference between var and let lies in their scope. A variable declared with var has either global scope (if declared outside a function) or function scope (if declared inside a function). It does not follow block scope, meaning it can still be accessed outside the block { } in which it is defined.
On the other hand, a variable declared with let is block scoped, which means it is only accessible within the block { } where it is declared.
 

// Using var
if (true) {
    var x = 10;
}
console.log(x); // No Error, print 10 (var is not block scoped).
// Using let
if (true) {
    let y = 20;
}
console.log(y); // Error, y is not defined (let is block scoped).