Francisco's frustration is most evident in option B, where he expresses tiredness because his teacher's words made no sense, highlighting the language barrier.
Step-by-step explanation:
The piece of evidence that best reveals Francisco's frustration with his new school is B "By the end of the day, I was very tired of hearing Miss Scalapino talk because the sounds made no sense to me." (Paragraph 12). This statement directly conveys Francisco's sense of exasperation and tiredness stemming from his inability to understand the language used by his teacher, which is a clear indication of his frustration with being unable to follow the class.