Which source is most likely to be impartial

A university study or Educational field source is most likely to be impartial.

Explanation:

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Government data and data collected by individual companies can be partial. So, you may want to use some encyclopaedia like Britannica or Wikipedia. I personally prefer Britannica, as Wikipedia sometimes reflect personal views because anyone can edit it. You can visit some research by universities. I will advise to refer to more than one sources, so you can decide for yourself what to include and what not to include.

world bank is the correct answer.

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.