Which of the following will be sufficient grounds to set aside or excuse a party's performance under a contract?

a. The true value of the goods ("the consideration") was much less than the amount agreed to be paid.

b. The performance has become more costly.

c. One of the parties lacked capacity (e.g., a minor) at the time the contract was made.

d. Performance of the contract became illegal (e.g., trade embargo imposed by the party's government on the country of destination ).

e. Only c and d

f. All of the above.