Analogy Explanation:

The given analogy is Typist : Typewriter :: Writer : ?

In this analogy, the first term is related to the second term in the same way as the third term is related to the fourth term.

- A typist is a person who operates a typewriter.
- Similarly, a writer is a person who uses a writing tool to create content.

Therefore, the answer to this analogy is option 'B' - Pen.

Explanation of Other Options:

a) Book: A book is a collection of written or printed pages that are bound together. A writer may create a book, but a book is not a tool that a writer uses to create content.

b) Pen: A pen is a writing tool that a writer uses to create content. This option is the correct answer to the given analogy.

c) Script: A script is a written document that contains the dialogue and action of a play, movie, or television show. While a writer may create a script, a script is not a tool that a writer uses to create content.

d) Paper: Paper is a material that a writer may use to record their content, but it is not a tool that a writer uses to create content.