Which of the following correctly creates a thumbnail of the CodeHS logo that links to https://codehs.com?

The option that successfully creates a thumbnail of the CodeHS logo that links to https://codehs.com integrates an anchor element correctly with an image inside it. In this case, the anchor element (<a>) serves as a clickable link directing users to the specified URL when they click on the image of the CodeHS logo.

The use of the class "thumbnail" on the anchor element is appropriate, as it allows for CSS styling to be applied, enhancing the visual presentation of the link. Furthermore, the img tag correctly includes the source attribute (src) pointing to the logo file and the alt attribute, which provides a text description of the image for accessibility purposes.

This combination enables the desired functionality of linking to an external site while displaying the logo as a clickable thumbnail. The alternative choices do not follow this structure correctly, lacking either the proper placement of the anchor element or misplacing the attributes necessary for the desired outcome.