Which fallacy does the following passage commit?

a. professor fallon has asked us to purchase a coffeemaker for her office.
b. but we shouldn’t do that because next she’ll want a microwave, and then a convection oven.
c. then she’ll want a full-sized refrigerator, a sink with hot and cold water, a dishwasher, and a complete set of expensive china.
d. this will exhaust the budget of our department.

After graduating from college with a degree in education, matt found a teaching jobin saudi arabia. he figured that a teaching job in the middle east would be the same as a teaching job in the united states. while there were similarities between american and saudi schools, matt was unprepared for the differences between the two cultures. on the first day, a number of his students arrived later than the class's designated 10 a.m. starting time. later, during a break, he noted that his students seemed to stand closely to each other and to him when they spoke. after class, a confused matt asked the american director of the teaching program about these observations. that's why it's always important to do your homework! the director responded with a laugh. what is the possible explanation that director could gave him?