Explanation:

The correct answer is option B, which is a Compact disc (CD).

A Compact disc (CD) is a flat and shiny circular device that is used for loading songs, movies, and games in a computer system.

Compact Disc (CD)
- A CD is a type of optical disc that is used for storing and playing digital audio, video, and other data.
- It has a diameter of 12 centimeters (4.7 inches) and is typically made of plastic.
- The surface of a CD is shiny and reflective, allowing it to store data in the form of microscopic pits and lands.
- These pits and lands are read by a laser beam in a CD drive, which converts the data into digital information that can be processed by the computer.
- CDs have a large storage capacity, typically ranging from 650 megabytes to 700 megabytes.
- This allows them to store a significant amount of data, including songs, movies, and games.
- CDs are widely used for distributing software, music albums, and movies.
- They are also commonly used for creating backups of important data.

Other Options:
a) Floppy disk:
- Floppy disks were used in the past for storing and transferring data.
- They are small and flexible, with a lower storage capacity compared to CDs.
- Floppy disks are no longer widely used due to their limited storage capacity and slow data transfer speeds.

c) Pocket drive:
- A pocket drive is a type of portable hard drive that is small and lightweight.
- It is used for storing and transferring large amounts of data.
- Pocket drives are typically connected to a computer via a USB or Thunderbolt port.

d) Hard disk:
- A hard disk is a non-volatile storage device that is used for storing and retrieving digital information.
- It consists of one or more rigid disks coated with a magnetic material.
- Hard disks are commonly used as the main storage device in computers and can store large amounts of data.