We don't dare allow the public-school teachers to have another week of summer vacation. If we do, then the police will want the same thing. Then it will be the firemen, park rangers, highway patrol, social service workers, highway personnel, and motor vehicle workers. In the end, everyone will be working less for the same amount of money.
a. begging the question
b. slippery slope
c. ad populum
d. ad verecundiam