A college student on her way to take an exam remembers that she doesn't have a pencil with an eraser--which the instructor asked everyone to bring. The store where she stops doesn't have regular pencils--but it does sell Scripto mechanical pencils priced at $2.95. That is what she buys. This case illustrates the effect of:
A. personal environment.
B. culture.
C. purchase situation.
D. learned set.
E. dissonance.