Final answer:
The best passage illustrating Botchan's sense of being overwhelmed is when he admits to being made a fool of and being at a loss, showing his struggle with the students' behavior.
Step-by-step explanation:
The passage from Chapter 4 of Botchan that best exemplifies that the protagonist is overwhelmed by his students is option C which reads, "The fools at both ends were bent on making a goose of me. I realized this, but then I was at a loss what to do. I frankly confess that I have not quite as much tact as dashing spirit." This passage directly conveys Botchan's feeling of being ridiculed and his admission of being unsure about how to handle the situation, indicating his sense of being overwhelmed by the students' behaviors.