Who appointed titles and power to the boyars

When Ivan IV came to power in 1547, much more of the boyar's independent political power became obsolete. The independence and autonomy experienced by the princes of the regions in Russia was abolished under Ivan IV by the end of the sixteenth century, making them “the prince’s sons”, or just simple boyars serving the Grand Prince.

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.

no the answer is c only objects touching the earth's surface can be acted upon by an outside force