What is a legal requirement for an insurance contract's purpose?

In an insurance contract, the purpose must be legal and not against public policy to ensure that the agreement is enforceable in a court of law. If an insurance contract involves illegal activities or goes against established public policies, it is considered void and cannot be upheld. This principle is fundamental to all contracts, including insurance, as it upholds the integrity of the legal system and ensures that all parties are engaging in lawful transactions.

While the other options may reflect aspects of contracts in general, they do not represent a legal requirement like option B. Contracts can be beneficial to one party, involve some negotiation, or even aim for a charitable purpose, but the key requirement is that they must adhere to the law and align with public policies for them to be valid and enforceable.