When an Experimenter Finds That the Manipulation of an Independent

When an experimenter finds that the manipulation of an independent variable produced a change in the dependent variable, with all other factors held constant, then

A) the correlation between the independent and dependent variables must show significant differences.
B) the experimenter can conclude that the change in the independent variable caused the change in the dependent variable.
C) the change in the dependent variable was the cause of the differences in the independent variable.
D) the experimenter can make no conclusions except that the groups differ.