What is the proper JavaScript code to change the content of a paragraph with the id "second" to "What does the Fox say?"

The choice stating that the code snippet is correct, reflects proper JavaScript syntax for accessing and modifying the HTML content of an element with a specific ID. Here’s how this works:

In JavaScript, document.getElementById() is a method used to select an HTML element by its unique ID. Once the element is selected, you can manipulate its properties, such as innerHTML, which allows you to change the content within that element.

The expression document.getElementById('second').innerHTML = "What does the Fox say?"; accurately retrieves the element with the ID "second" and sets its innerHTML property to the string "What does the Fox say?" This updates the content of the paragraph to the specified text.

It's important to note that the inclusion of a semicolon at the end is a good practice in JavaScript, indicating the end of a statement.

Overall, this syntax is correct and effectively accomplishes the task of changing the content of the specified HTML element.