Richard Miller and Colleagues (1975) Investigated the Reduction of Littering

Multiple Choice

Richard Miller and colleagues (1975) investigated the reduction of littering in three classrooms. Which class still showed a reduction in littering two weeks after the study ended?

A) The class that was repeatedly told that they should be neat and tidy
B) The class that was reprimanded repeatedly for littering
C) The class that was repeatedly congratulated for being neat and tidy
D) The class whose littering was ignored