Final answer:
The best interpretation of the statement "If it is made of glass, it may break" is that if something breaks, then it must be made of glass, but not all glass objects will necessarily break.
Step-by-step explanation:
The statement "If it is made of glass, it may break" implies that if something is made of glass, there is a possibility that it will break, but it does not necessarily mean that it will break. Therefore, the best interpretation of the statement is option c) "If it breaks, it is glass." This means that if something breaks, then it must be made of glass, but not all glass objects will necessarily break.