In an experiment,which term refers to the variable that is controlled or manipulated by the researcher

A)  stimulus variable 
B)  dependent variable 
C)  control variable 
D)  independent variable

Independent Variable

The variable in an experiment that is manipulated or changed by the researcher to observe its effect on the dependent variable.

Stimulus Variable

A Stimulus Variable is a factor in an experiment that can be changed or manipulated to observe its effects on the outcome.

Control Variable

A variable that is kept constant or unaltered in an experiment to ensure that the effects observed are due to the independent variable.