What can you store in iCloud Drive?

iCloud Drive allows you to store various types of files, making it a versatile cloud storage solution. You can save and organize any file that is compatible with Apple's system, which includes documents, images, spreadsheets, presentations, and more, as long as they meet the required format specifications. This flexibility enables users to back up important data and seamlessly access it across all their Apple devices, ensuring a smooth workflow.

The other choices describe very limited storage options. Storing only photos and videos would restrict iCloud Drive's capabilities since it is designed to handle a broader range of file types. Limiting storage to just software applications or only email attachments would similarly undermine the primary function of iCloud Drive, which is to serve as a comprehensive storage solution for any compatible files. Thus, the correct answer encapsulates the full range of file storage capabilities iCloud Drive offers.