What two elements must be present in a contract to achieve complete agreement?

The correct choice emphasizes the importance of a "meeting of minds" and legality in establishing a complete agreement in a contract.

A meeting of minds, also known as mutual assent, means that both parties have a mutual understanding and agreement on the essential terms of the contract. This is critical for contract validity because it ensures that all parties share a common intention and understanding of their rights and obligations under the agreement.

Legality refers to the requirement that the subject matter of the contract must be legal and not against public policy. A contract that involves illegal activities is not enforceable in a court of law. Therefore, both a meeting of minds and legality are essential for a contract to be valid and binding.

Written documentation and signatures can enhance the clarity and enforceability of a contract, but they are not strictly necessary for a contract to exist, as verbal agreements can also be valid. Mutual consent and consideration are important concepts too, as consideration refers to something of value exchanged, which is crucial for contract validity; however, it doesn't encompass all elements needed for complete agreement as defined by the question. Disclosure and transparency are vital in many contexts but do not constitute the fundamental legal elements required to form a binding contract.