The answer is E. Sharpener.
Ink, paper, and pens are all tools used for writing, while a sharpener is a tool used to sharpen pencils.
Ink is a liquid or paste that is used to write or print. It is typically made from a mixture of pigments, solvents, and other additives. Ink can be applied to paper or other surfaces using a variety of tools, such as pens, brushes, or rollers.
Paper is a thin, flexible material that is used for writing, printing, and other purposes. It is typically made from wood pulp that has been processed and bleached. Paper can be coated with a variety of materials, such as ink, to improve its properties.
Pens are writing instruments that use ink to create marks on paper or other surfaces. They typically have a nib, which is the part of the pen that comes into contact with the paper, and a barrel, which contains the ink. Pens can be made from a variety of materials, such as metal, plastic, or wood.
Pencils are writing instruments that use graphite to create marks on paper or other surfaces. They typically have a lead, which is the part of the pencil that comes into contact with the paper, and a wood or metal casing. Pencils can be sharpened using a variety of tools, such as a sharpener or a knife.
A sharpener is a tool that is used to sharpen pencils. It typically has two blades that are used to grind the lead of the pencil to a point. Sharpeners can be manual or electric.