Plato thought that rulers should people who were worthy, instead of people who inherited power or won it through military means, this type of government was called a an aristocracy.
b monarchy
c communism
d democracy

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

d

explanation:

it establishes america’s basic laws and fundamentals to its citizens.