3.
My son is failing algebra. Evidently his teacher, Mr. Williamson, isn’t doing a good job.
A month after the president took office, the stock market went into a tailspin. I don’t think he knows the first thing about managing the economy.

a. False cause (the argument assumes that the order of events alone shows cause and effect)

b. False comparison (the argument assumes that two things being compared are more alike than they really are)

c. Either-or (the argument assumes that there are only two sides to a question)