Answer:
B. Ad hominem attack
Step-by-step explanation:
Fallacy can be defined as a mistaken or false belief that are based on illogical arguments or reasoning.
However, a lot of people might actually think it to be true but it isn't. There are various types of fallacy and these include; black or white, non sequitur, bandwagon, appeal to authority, straw man, and oversimplification or hasty generalization, appeal to ignorance, ad hominem, etc.
Ad hominem can be defined as a type of fallacy in which the motive, character, or some other aspect of a person is attacked rather than his or her position.
This ultimately implies that, an ad hominem is typically based on prejudices, emotions, or feelings rather than appealing to reason, intellect or substance.
In this scenario, the logical fallacy used in the above passage is an ad hominem attack. We can deduce from the passage that the speaker targeted or appealed to the grade of the opponent rather than focus on issues around being an effective class president.