Shopping is how we acquire needed products and services,but social motives for shopping also are important.Which of the following best completes the sentence,'Shopping is an activity that we can perform for either ______ or ______ reasons?

A) Selfish,unselfish.
B) Formal,informal.
C) Charitable,selfish.
D) Utilitarian,entertainment.
E) Utilitarian,hedonic.

A(n) ________ is a graph that describes how well an acceptance plan discriminates between good and bad lots.