Final answer:
Bootstrap uses HTML, CSS, and JavaScript to create responsive and mobile-first websites. It combines CSS classes and JavaScript plugins with HTML to aid in the development of modern layouts.
Step-by-step explanation:
Bootstrap is a powerful front-end framework used for developing responsive and mobile-first websites. The correct answer to which technologies Bootstrap uses is E. HTML, CSS, and JavaScript. Bootstrap provides a set of CSS classes and components, as well as JavaScript plugins, which you can include in your HTML to quickly develop modern and responsive layouts. By utilizing Bootstrap, you can save time and ensure consistency across different browsers and devices.