Answer:
D) An illusory promise
Step-by-step explanation:
An illusory promise is not enforceable. Illusory promises are simply illusions that seem or appear to a contract, but are not.
In this case, there is no consideration at all, therefore none of the parties is bound by a contract. It would be different if the company promised to pay a bonus if its profits are xx%. How can someone determine what is considered high profits, and how can you be sure that management will agree?
It is basically like telling someone else that you will give them something if you are happy and willing to do it. How can someone determine if you are happy or not, and how can someone know if you are willing to do it or not?