Researchers believe that the continued maturity of which lobe of the cortex during young adulthood is responsible for cognitive changes such as focusing attention and goal-directed behaviors that lead to expertise:
A. frontal
B. parietal
C. occipital
D. temporal

frontal

Explanation:  the overall volume of the brain do addup (increases) at the earlier(first) life stage and then becomes at a stand still (stable) .adolescence is the level of development where children are becoming adults thereby developing in terms of their intellectual capabilities, physical growth e;g increase in height, hormone activation e.t.c. they have a series of life changing or transformation .adolescence maturing in the brain is usaully between 10–23 years and it is influenced by different factors such heredity and environment, prenatal/postnatal insult, nutrition e.t.c

The frontal lobes of the cortex contains different components of the neural circuitry e.g planning, working memory, impluse control e.t.c. Usuall at times, they are not fully mature or developed later stage of life. .The prefrontal cortex in the simple sense usually help in  higher-order cognitive processes and executive functioning.  

    racial conflict and discrimination has existed ever since man learned to kill with rocks and bones. these conflicts arose from disputes between territory, power, wealth, religion, or simple difference. some of the most infamous racial disputes include slavery, the holocaust, and the civil rights movement.

    these listed disputes often resulted in casualties from all sides. riots, wars, imprisonment, and lynching are all commonly associated with racial conflict on severe levels.

      however, racism is an improving issue in recent decades. people are being more accepting and welcoming of diverse populations. though, the world isn't perfect and it will take much more time, if ever, until the world is rid of racism.

facts: the 14th amendment

the 14th amendment addresses citizenship rights and equal protection of the laws.

the 14th amendment was intended to protect the rights of former slaves after the american civil war.

the 14th amendment was approved by congress in june of 1866 and ratified by the states on july 9, 1868.

the 14th amendment establishes that all persons born in the united states are citizens and are guaranteed all the rights of citizenship.

the 14th amendment establishes that the law protects all citizens equally.

in this case the passage of the 14th amendment   that was violated was the last part in which it states that there is equal protection of the law.