When Evaluating an Experiment, One Needs to Consider Its External

When evaluating an experiment, one needs to consider its external validity, or

A) the degree to which the results of the study can be generalized to other individuals in different settings.
B) the size of the experimental effect reported in the study.
C) the degree to which the changes in the independent variables are a result of the manipulation of the dependent variable.
D) the degree to which alternative explanations for the results of the study can be ruled out.
E) the degree to which the changes in the dependent variables are a result of the manipulation of the independent variable.