Which of the following is valid consideration?Try to state t

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Which of the following is valid consideration?Try to state the law to justify your answer.
a.An action six month ago for which the person who carried it out is now demanding payment
b.A promise to pay for goods in six month time
c.A request to someone to clean your windows
The more you write,the better .thnak u so much

Consideration is the concept of legal value in connection with contracts.It is anything of value promised to another when making a contract.It can take the form of money,physical objects,services,promised actions,abstinence from a future action,and much more.Under the notion of "pre-existing duties," if either the promisor or the promisee already had a legal obligation to render such payment,it cannot be seen as consideration in the legal sense.
再问： and which one is correct？

Which of the following is valid consideration?Try to state t which of the following should be taken into consideration in Valid comments in Java include which of the following which of the following is not a state of the united states? 英语翻译全句是：According to the passage,which of the following is t SAT2化学which of the following is not a state function?A Tempe Which of the following is 帮忙做英语阅读理解4.Which of the following is NOT true according to t Which of the following statements is Not true according to t Which of the following is commercial risk in international t 英语翻译This kind of consideration is valid when the exchange of Which of the following is TURE according to the passage?