Explanation:

A block statement (or compound statement) in JavaScript is used to group multiple statements together within curly braces {}. It is typically used in control structures like if, for, while, and function definitions.

Example of a Block Statement:

{

    let a = 10;

    let b = 20;

    console.log(a + b); // 30

}

• The {} braces group the let declarations and console.log() into a single block.
• The block does not affect execution unless used in a specific context (like inside an if or loop).

Why Not Other Options?

• (B) Both conditional block and single statement → Incorrect. A block statement can contain multiple statements, not just a single statement.
• (C) Block that contains a single statement → Incorrect. A block is meant to group multiple statements, although it can contain just one.
• (D) Conditional block → Incorrect. A block can be used inside conditionals, but it is not limited to them.