What option should be selected in the 'Export As' dialog to prepare an image for web use?

Selecting the option to 'Convert to sRGB' in the 'Export As' dialog prepares an image for web use by ensuring that the colors are displayed accurately across different devices and browsers. sRGB (Standard Red Green Blue) is the baseline color space used by most web browsers and online platforms. By converting images to this standard color space, you mitigate the risk of color discrepancies that could arise from variations in how different devices handle color.

When preparing images for the web, it's essential to maintain color consistency, so using sRGB helps ensure that the colors look the same regardless of the user's hardware or software setup. This is particularly important for photographs and images intended for marketing materials where branding and color accuracy are critical.

While options like resizing the image or adjusting the resolution can also be relevant for optimizing images for web usage, they do not directly address the critical issue of color fidelity as effectively as converting to sRGB does. Thus, choosing to convert to sRGB stands out as the most vital step for preparing an image specifically for the web.