The correct answer is C. text, files, images.
An email can contain text, files, images, and other attachments. The text of an email is the message that is sent to the recipient. The files that can be attached to an email include documents, spreadsheets, presentations, and images. Images can be included in the body of an email or as an attachment.
Option A is incorrect because images can be included in an email. Option B is incorrect because files can be attached to an email. Option D is incorrect because images and videos can be included in an email.