Crack is considered more addictive than cocaine because it is .
a. cheaper, so people can afford more of it
b. frequently smoked in combination with pharmaceuticals
c. easier to get, so people can take more at once
d. smokable, so it reaches the brain more quickly

d. smokable, so it reaches the brain more quickly

Explanation:

idk why people so addicted to smoking if anyone look at this please don't not do smoking or drugs its bad for you and your lungs,

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.