The law on contracts is provided for which of the following documents in the Philippines?

The legal framework for contracts in the Philippines is primarily outlined in the Civil Code, particularly in Republic Act 386. This law encompasses the general principles governing contracts, including definitions, essential requisites, forms, effects, and various types of contracts. It serves as the foundational legislation for contractual obligations and rights, providing clarity and structure to contractual relationships.

The mention of specific numbers in the other options aligns with different laws that focus on various aspects of legal governance but do not specifically address contracts. Therefore, Republic Act 386 stands out as the correct choice for understanding the law on contracts in the Philippines.