Art teachers must often deal with "artist's block" in their students. To break the block, they advise students to make a mark on the canvas with the...

Art teachers must often deal with "artist's block" in their students. To break the block, they advise students to make a mark on the canvas with the paint brush. The professors are hoping to initiate

a. the post-reinforcement pause.b. a variable ratio schedule.c. a variable interval schedule.d. the ratio run.