Which of the following is an EO for positive reinforcement?
a) A long period of inactivity makes behaviors that result in physical activity more likely
b) A decrease in pain makes behaviors that result in getting rid of the pain less likely to occur
c) A difficult task makes behaviors that result in termination of the task more likely
d) An increase in temperature (e. G., a hot day) makes behaviors that result in getting warmer less likely to occur