The correct answer is: Quasi.
Consideration is the price paid for a promise. It must be sufficient, but it does not need to be adequate. Sufficient consideration means that the promisor must give something of value to the promisee. A promise to do something that one is already obligated to do is not sufficient consideration. A promise to do something that is impossible or illegal is also not sufficient consideration.
Adequacy of consideration means that the value of the consideration given by each party must be in proportion to the value of the promise made by the other party. However, the law does not require that consideration be adequate. In other words, the law does not care if one party gives more or less value than the other party.
Quasi-contract is a legal doctrine that allows a court to impose an obligation on a party who has received a benefit from another party, even if there was no contract between the parties. Quasi-contract is based on the idea of unjust enrichment, which means that a person should not be allowed to keep a benefit that they have received without paying for it.
In the context of the question, quasi-consideration is not valid consideration because it is not bargained for. In other words, the promisor did not receive anything of value in exchange for their promise.
Complete consideration is consideration that is sufficient and adequate. In other words, it is consideration that is both bargained for and of value.
Party consideration is consideration that is given by a party to a contract. In other words, it is consideration that is given by the person who is making the promise.
Legal consideration is consideration that is valid under the law. In other words, it is consideration that meets the requirements of the law of contracts.