What is true about a literal array in JavaScript?

A literal array in JavaScript is defined using array literal notation, which allows you to specify the values of the array directly within square brackets at the time of creation. This means that the values are literally set at the moment the array is created, making option C the correct choice.

For example, when you write let numbers = [1, 2, 3];, you are creating an array that literally contains the values 1, 2, and 3 right from the start. This approach is concise and straightforward for initializing arrays with known values.

The other options present situations that do not accurately describe a literal array. For instance, stating that a literal array contains no predefined values does not hold true, as it explicitly contains the values provided within the brackets. Similarly, the notion that it adds items one at a time would suggest a method of constructing an array that is not specific to literal notation; it describes a dynamic approach, whereas literals are statically defined. Lastly, claiming that an array requires an array constructor misrepresents how literal arrays function because they can be created simply using the square bracket syntax without needing the Array constructor.