Final answer:
The best paraphrase of Article 9 is that 'contracts for sale must be in writing,' which ensures clarity and enforceability in legal transactions.
Step-by-step explanation:
The most accurate paraphrase of Article 9 could be summarized as: contracts for sale must be in writing. This implies that any agreement related to the sale of goods, properties, or services should be documented in written form to have a legal standing and ensure clarity and enforceability. In the context of legal disputes, the need to interpret contract language accurately is essential, and this often involves the application of various rhetorical strategies. Therefore, ensuring that contracts are well-documented is not only a matter of legal conformity but also a means of avoiding ambiguity that could complicate potential legal proceedings.