正解:B
A markup language is a type of language that uses tags or symbols to define the structure and appearance of web content. HTML is the most common markup language used for creating web pages. HTML tags can specify how the text, images, links, and other elements are displayed by the web browser. Other markup languages include XML, which stores structured data using customizable tags, and Markdown, which simplifies the formatting of text documents. References: HTML: HyperText Markup Language | MDN, Markup Language Definition - What is a markup language? - TechTerms.com