Kay, an art collector, promised hammer, an art student, that if hammer could obtain certain rare artifacts within two weeks, kay would pay for hammer's postgraduate education. at considerable effort and expense, hammer obtained the specified artifacts within the two-week period. when hammer requested payment, kay refused. kay claimed that there was no consideration for the promise. hammer would prevail against kay based on:

   Unilateral contract

Explanation:  Also known as a one-sided contract, when one party called the offeror in this case, Kay, promises something in the form of a money or some good, in exchange for some act or good. The other person in this case, Hammer, who is to reciprocate by some act or good (obtain rare artifacts) as an exchange to the one who made the promise, is called offeree.

the correct answer is modern american cars are not available due to trade restrictions.

trade between cuba and the united states have serious restrictions. the u.s. imposed an economic embargo on cuba, that among other things means that modern american cars are not available due to trade restrictions.

in response to some governmental actions of the authorities from cuba, president john f. kennedy proclaimed an embargo on trade between both countries in february 1962. the trade embargo remains active until this day and was implemented directly by the departments of commerce and the department of treasury.

in president trump’s administration, there is a national security presidential memorandum that "strengthens the policy of the u. s.", affecting trade with cuba.