When Conducting Marketing Experiments, the Independent Variable Often Involves Marketing

When conducting marketing experiments, the independent variable often involves marketing mix elements such as product features or coupons, while dependent variables often include

A) changes in purchases such as dollar sales of individuals or organizations.
B) changes in channels of distribution or pricing rather than product features or price.
C) elements of the marketing mix that cannot be manipulated.
D) the primary experimental hypothesis.
E) elements of environmental forces that cannot be controlled.