She said " fine , but if you do n't eat that entire thing I ' m going to shove it up your butt ! " . No joke . Dear old Grandma said that . Which comes to another point , she was cheap too .

Based on the preceding passage, choose your answer for question What may be the reason for their grandma 's statement ?
Choose your answer from:
a). She is cheap when it comes to food .
b). She does n't like to see leftovers on plates .
c). She does n't want to clean up leftovers .
d). None of the above choices .
The answer is:
a).