At the time when the mom is a real beer when she should be mad is to be considered as the option a. metaphor.
It is the figure of speech that should have the rhetorical effect which defined one thing by mentioning the other.
At the same time, it gives the clarity or the identity is hidden that lies between two different ideas.
While on the other hand, A simile refers figure of speech that directly compares two things.
hence, the last option is correct.
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