Analyzing an Ineffective Prompt Structure

The following prompt has been divided into three sections (A, B, and C). Analyze the prompt and match each section to its corresponding structural component.

Section A: You are a helpful assistant that translates English to French. Your translations should be formal.

Section B: English: 'Hello, how are you?' French: 'Bonjour, comment allez-vous?'

Section C: English: 'I need to buy some bread.' French:

A developer wants to use a language model to generate a Python function that calculates the factorial of a non-negative integer. Which of the following prompts is most effectively structured to guide the model towards the desired output by clearly separating instructions, examples, and the specific request?