Answer:
The most appropriate answer option is A. inform her teacher and use a different beaker
Step-by-step explanation:
According to the safety standards specified to perform experiments in a laboratory, Stacey should inform her teacher and try to use a different beaker if she sees a crack on hers.
This is to ensure maximum safety which in no case should be compromised. Because the beaker still might break in the middle of an experiment, even if it was not leaking before or she covered it with a tape, thus causing harm to her.