What does responsive web design aim to achieve?

Responsive web design aims to create optimal viewing experiences across a wide range of devices by ensuring that websites adjust smoothly to different screen sizes and orientations. This approach allows users to easily read and navigate a site with minimal resizing, panning, and scrolling, which enhances usability and improves the overall experience, whether on a desktop computer, tablet, or smartphone.

By employing flexible grids, layouts, and images, as well as CSS media queries, responsive design ensures that content is presented in a way that is appropriate for the specific device being used. This adaptability is crucial in today's digital environment, where users access websites from various devices with differing capabilities.

The emphasis on creating optimal viewing experiences is in stark contrast to the other choices. Fixed layouts restrict usability across devices, focusing only on specific screen sizes, while improving loading speeds is just one component of responsive design. Designing websites that are not mobile-friendly goes against the fundamental principles of responsive design, which prioritize accessibility and a good user experience on mobile devices.