The standard file format for creating and structuring web pages is HTML (Hypertext Markup Language). HTML consists of a series of tags that define the structure and content of the webpage, making it the appropriate choice for your project.
The other formats mentioned are:
- CSV (Comma-Separated Values) is used for storing tabular data.
- PNG (Portable Network Graphics) is an image format.
- MP3 (MPEG Audio Layer III) is an audio format.
Therefore, the correct answer is HTML.