Answer: Option C
Explanation:
In simple words, legally sufficient refers that a contract has been reviewed by an attorney who has confirmed that the contract made is in compliance with every rule and procedure in the eyes of law.
The legal sufficiency is checked so that in case of some future issues arising between the parties related, the jury could easily depict the problem and can help the guilty party accountable.
Thus, to constitute consideration the value of exchange must be legally sufficient.