Explanation:

To read or "run" a Compact Disc (CD) in a computer, the essential component required is a "CD drive." This optical drive is specifically designed with a laser and mechanism to read data encoded on CDs. Option (a) "FD drive" refers to a Floppy Disk Drive, which reads floppy disks. Option (c) "Zip drive" is an older type of removable magnetic disk storage. Option (d) "Pen drive" (or USB flash drive) is a solid-state storage device that connects via a USB port. None of these other drives are capable of reading CDs. Therefore, (b) CD drive is the only correct answer for running a CD.