Last night I made the fudge from the family recipe 's , and just like mom 's mine turned out so hard after being in the freezer for 5 min that it could not be cut or eaten for that matter . maybe I did n't put enough butter in it ! The recipe called for a chunk of butter " now how much exactly is a chunk ? "

Generate a question about the above context.
What may be the reason for their brownies turning out bad ?
Choose from:
+ They did not listen to others about what to do .;
+ They did not use the right ingredients .;
+ None of the above choices .;
+ They did not follow the instructions correctly .;