Which of the following might cause glass to break in a freezer? Putting thin glass in the freezer
Setting the temperature too low
Failing to allow room for expansion
Freezing any liquid in a glass container

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.

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