The legal mechanism for evaluating the existence of an incentive or inducement for a person's promise which will establish a binding contract is called Consideration.
Consideration means something is given in return, It can be anything that compensate the another party for any service or goods is given to the promisee.
Consideration is the legal mechanism for ascertaining the state of an incentive for a person's promise that will result in a binding contract.
Therefore, option A (Consideration) is correct.
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