A. JavaScript
Because JavaScript is a programming language that allows webpages to become more interactive with users. It is primarily used for client-side scripting, meaning it runs directly within the web browser of the user. With JavaScript, developers can create dynamic and interactive elements on webpages, such as form validation, interactive forms, image sliders, real-time updates, and much more. JavaScript is widely supported by modern web browsers and is an essential tool for enhancing user experience and functionality on websites.