Mai Lin is checking out at the grocery store when she notices the candy display right next to the cash register. "I haven't had a Mounds bar in years," she thinks. "That looks good! I think I'll grab one." So she hands the candy to cashier and says, "I'll take this too." Mai Lin has just made a(n):
a. partially planned purchase
b. unplanned purchase
c. unwise purchase
d. fully planned purchase
e. frivolous purchase
ANSWER: b