Match Each the Situation That Illustrates It with Type of Extraneous

Match each the situation that illustrates it with type of extraneous variable that threatens the internal validity of an experiment.
-During the experiment students are exposed to special instructional experiences that are not part of the experimental treatment.

A) History
B) Maturation
C) Testing
D) Experimental treatment diffusion
E) Statistical regression
F) Differential selection
G) Experimental mortality