Which of the following JavaScript methods allows you to change the HTML content of an element?

The method that allows you to change the HTML content of an element is indeed the method that retrieves an element by its ID, enabling you to access and manipulate its properties.

When using getElementById, you first select the specific HTML element based on its unique ID. After retrieving that element, you can then modify its innerHTML or textContent properties to change the content displayed on the web page. This makes getElementById a fundamental part of the Document Object Model (DOM) manipulation in JavaScript.

In contrast, setElementById, changeElement, and modifyElement are not standard JavaScript methods. As such, they do not exist in the language's repertoire for manipulating HTML content, which makes them invalid options for this task. Understanding the correct way to manipulate the DOM using methods like getElementById is essential for effective web development.