The correct answer is C. DVD.
A CD-R (Compact Disc Recordable) is a type of optical disc that can be written to once. It has a capacity of 700 MB or 800 MB.
A CD-RW (Compact Disc Rewritable) is a type of optical disc that can be written to and erased multiple times. It has a capacity of 700 MB or 800 MB.
A DVD (Digital Versatile Disc) is a type of optical disc that can store more data than a CD. It has a capacity of 4.7 GB or 8.5 GB.
A VCD (Video Compact Disc) is a type of optical disc that can store video and audio. It has a capacity of 233 MB or 746 MB.
A floppy disk is a type of magnetic storage medium that was used to store data on personal computers. It has a capacity of 1.44 MB.
Therefore, the DVD has the most capacity.