Which of the following is the correct extension of the Python file?

Answer: Option C

The correct extension of a Python file is .py.
Python files typically have the extension ".py", which indicates that they contain Python code. When you save a Python script, you should use the ".py" extension at the end of the file name to ensure that it's recognized as a Python file by the interpreter and text editors. Using the correct file extension also helps maintain organization and clarity in your project directory.