Which of the following is a benefit of using relative units like ems and rems?

Using relative units like ems and rems provides key advantages, particularly in terms of accessibility and flexibility in web design. One significant benefit is that they allow text to scale based on user preferences. This means that when a user adjusts their browser's default font size for better readability, elements sized with ems or rems will automatically adjust accordingly, enhancing usability and improving the overall experience.

This scaling capability is crucial for responsive design, as it contributes to a more user-friendly interface across different devices and user settings. It allows developers to create websites that are more adaptable to individual user needs, particularly for those with visual impairments who may require larger text.

While the other choices address aspects of web development, they do not highlight the primary functional benefit of relative units; hence, they are not as relevant in contrast to the essential feature of user preference scaling that ems and rems provide.