Final answer:
To reduce the file size of an email attachment, use a compression tool like WinZip or WinRAR.
Step-by-step explanation:
To reduce the file size of an email attachment, the student should use a compression tool such as WinZip or WinRAR to compress the file.
These tools allow the student to compress the file by reducing its size without losing any data. The compressed file can then be attached to the email and sent more efficiently.
For example, if the student has a large PowerPoint presentation, she can use WinZip to compress it into a ZIP file, which will significantly reduce the file size while preserving all the content.