Look at the following examples of comments and docstrings in Python.

The correct answers are A and C. Option A uses a concise one-line docstring that explains the function’s purpose in a useful way. It follows the common Python documentation style by describing what the function returns rather than repeating implementation mechanics. Option C is also useful because the inline comment explains why the value is being adjusted, not merely what the code already shows. Option B is poor because it restates the obvious operation n = n - 1; such comments add noise instead of clarity. Option D is weaker because the docstring describes internal mechanics and argument handling rather than the function’s intended result. Good Python comments should clarify intent, purpose, or non-obvious reasoning.