Jessica Is Concerned with the Problem of Reactivity in Her

Jessica is concerned with the problem of reactivity in her study of a local diet group.Which of the following is NOT one of her reactivity concerns?

A) The members of the diet group might alter their behaviors because they know they are being studied.
B) The members of the diet group might alter their lifestyles and behavior because they joined the group to lose weight.
C) The members of the group might expel her from doing the research.
D) The members of the group might alter their discussion of diet strategies because they know that she is studying the group.
E) The members of the group may quit the program out of fear that their identities will be revealed.