Ginger Bought a Phone That Came with a $10 Rebate

Multiple Choice

Ginger bought a phone that came with a $10 rebate. Ginger should fill out and mail in the rebate form if:

A) the opportunity cost of the time and trouble of sending in the rebate form is less than $10.
B) the opportunity cost of the time and trouble of sending in the rebate form is more than $10.
C) she would have bought the phone without the rebate, and so sending in the rebate form involves no opportunity cost.
D) Ginger's surplus from purchasing the phone was less than $10.