Alejandro is developing a preliminary research study to address the question of whether 4-year-olds who are asked to delay gratification (e. g., to delay eating candy) perform differently in solitude than with other 4-year-olds. which combination of research perspectives would be best for this preliminary study?

The answer is "Developmental Psychology and Social Psychology".

Developmental psychology is the scientific study of how and why individuals change through the span of their life. Initially worried about babies and youngsters, the field has extended to incorporate immaturity, grown-up improvement, maturing, and the whole life expectancy.  

Social psychology  is the scientific study of how individuals' musings, sentiments, and practices are affected by the real, envisioned, or suggested nearness of others.

    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.

d.) continue to rise rapidly