According to the study by simon and martens comparing state anxiety before competitive sports to state anxiety before other childhood evaluative activities, the activity with the highest state anxiety levels was

The activity with the highest state anxiety levels was: band solo.

Explanation:

The study in question is a classic sport psychology article written by Simon and Martens in 1979. It develops an important topic about sports and youth participation focuses on anxiety and its effects.  They demonstrated that band solos and other music activities have higher anxiety-producing levels than other sports activities, due to often being related with negative emotions and evaluation.

answer; migrate from a region;

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.