What is list comprehension in Python?

List comprehension in Python is defined as a concise way to create lists using a single line of code. This powerful feature allows you to generate new lists by applying an expression to each item in an existing iterable (such as a list or a range) and is often accompanied by an optional condition to filter the items.

For instance, you can create a list of squares from a range of numbers with the following syntax: [x**2 for x in range(10)]. This will produce a list of the squares of numbers from 0 to 9 in a clear and readable manner.

The advantages of list comprehension include improved readability and often better performance compared to using traditional loops to append items to a list. This feature exemplifies Python's emphasis on simplicity and coding efficiency, which is why option A accurately captures its essence.