Which diagnosis is most likely when panic attacks that are not usually provoked by any particular situation become a common occurrence, leading one to begin to worry about having the attacks and change behaviors as a result?

Well, since panic attacks occur frequently the best think to do is to make an appointment with a Psychiatric Doctor before the person begins to change his behavior as a result of these attacks, or have professional problems or even familiar problems.

Explanation:

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.