Ricardo and Luis Are Out Walking

Multiple Choice

Ricardo and Luis are out walking.Luis says,"Hey,I've got a pebble in my shoe," and proceeds to take off his shoe and to remove the pebble."That feels better," says Luis.Ricardo believes that Luis' behavior of removing the pebble is a(n) ____ because it increases the chance that Luis will repeat the behavior if another pebble gets in his shoe.

A) positive punisher
B) positive reinforcer
C) negative reinforcer
D) negative punisher