Burns got a job teaching at the local high-school. On the first day, he had many problems with class clowns and rude behaviors occurring during his lecture (e.g., one student sitting in the back would make squishy sounds every time Mr. Burns took a step). Burns had had enough of this about 30 minutes into his first class. He started subtracting 1 point from each student who spoke (or made squishy sounds) without first raising their hand. Mr. Burns found that this _____________________ procedure resulted in an immediate decrease in inappropriate verbal responses.

I was saying "Boo-ums"

squishy punishment

positive punishment

negative punishment