Country a prohibits trade with country b due to political reasons. this is an example of country c restricts the number of televisions country d may export to country c each year. this is an example of a.) a standard, a subsidy b.) a tariff, a subsidy c.) embargo, a quota

1. Country A prohibits trade with Country B due to political reasons. This is an example of "embargo".

An embargo is a government arrange that limits business or trade with a predetermined nation or the trading of explicit merchandise. An embargo is generally made because of negative political or financial conditions between countries. An embargo is intended to disconnect a nation and make challenges for its overseeing body, constraining it to follow up on the issue that prompted the embargo.  

2. Country C restricts the number of televisions Country D may export to Country C each year. This is an example of "a quota".

A quota is a government-imposed trade limitation that confines the number or fiscal estimation of products that a nation can import or fare amid a specific period. Nations use amounts in universal exchange to help direct the volume of exchange among them and different nations. Nations in some cases force them on explicit merchandise to lessen imports and increment local generation. In principle, quantities support household creation by limiting outside challenge.