If You Buy Food Which Then Is Put on Special

Multiple Choice

If you buy food which then is put on special at half price just after you paid,

A) you will be disappointed and be worse off.
B) you will be better off because you will go back to get some more food at bargain prices.
C) your welfare will not change since you just finished your shopping.
D) logic cannot lead to an answer to this question even if you have a typical preference pattern.