Frank was tested by the school psychologist and diagnosed with attention deficit hyperactivity disorder (ADHD). The test results have been explained to his parents. His parents are curious as to brain involvement and ADHD. The school psychologist informs them that .

The school informs frank.s parents that some research can indicate that ADHD is related to one of the most common mental disorders affecting children which is 'a delay in neural development'.

Explanation:

Attention deficit hyperactivity disorder (ADHD) is a complex neurodevelopmental disorder that can affect a child’s success at school, as well as their relationships. Children with ADHD may be hyperactive and unable control their impulses. Or they may also have trouble paying attention. These behaviors interfere with school and home life.

thomas jefferson

explanation:

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.