The correct answer is: B. A cartridge.
An inkjet printer is a type of printer that uses ink droplets sprayed from a print head to create an image on paper. The ink is stored in cartridges, which are then inserted into the printer. The cartridges contain either black ink or a combination of black and colored inks.
A drum is a cylindrical component in a laser printer that is used to create an image on a photosensitive drum. The drum is coated with a light-sensitive material that is charged by a laser. The charged areas of the drum attract toner, which is then transferred to paper.
A ribbon is a long, thin strip of material that is used in typewriters and dot matrix printers. The ribbon is coated with ink, which is transferred to paper when the keys are struck.
Therefore, the only option that is necessary for an inkjet printer is a cartridge.