Which of the following is a benefit of using 'decorators' in Python?

Using decorators in Python indeed provides the benefit of separating concerns and increasing code readability. Decorators allow you to wrap functions, enhancing their behavior without modifying their actual code. This separation helps keep the core functionality of a function distinct from additional features, like logging, access control, or authentication.

By applying a decorator, you can clearly define a piece of code that manages a specific concern while keeping the main function focused on its primary task. This approach not only makes the code cleaner but also enhances maintainability since you can reuse decorators across multiple functions without repeating the same code.

The other options may suggest benefits commonly associated with programming practices, but they do not accurately encapsulate the primary strengths of decorators. For instance, while decorators can sometimes lead to performance improvements, their main role is not optimization. Similarly, decorators do not directly address memory management or provide error handling; those are achieved through different mechanisms in programming.