"Your speeches need to be articulate and precise," Mr. Tucker instructed his class, "and they will sound far more natural if you practice them aloud."

As he spoke, he recalled his younger self in Spanish class. Because he had always done well on his written exams, the teenage Mr. Tucker had assumed he would ace the final oral assessment. Thus, in preparation, he pronounced not a word of Spanish. And during his oral examination, he stumbled over his words, unable to utter a single sentence.
Not wanting this fate for his students, Mr. Tucker now decided to tell his story.

Why does the use of flashback effectively advance the plot?
Responses

It gives the class a chance to know their teacher better, which will help the students develop into better writers.
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It demonstrates that Mr. Tucker lacks the personal and professional experience to teach a speech class.
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It provides an opportunity for Mr. Tucker to stress his advice through his own cautionary tale.

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