Answer is failing to allow room for expansion. Food expands when you freeze it, and the only place it has to go is the space you leave at the top. In order to prevent glass jars from breaking in the freezer, you need to leave plenty of room at the top.
Answer:
either c or d, you must define the problem first
OK so overall the safest is going to be choice A. because the others include climbing a ladder and that is never safe especially to do alone also it is safe because he is using his brain by plugging in the power strip.
